{"id":197,"date":"2022-01-16T15:41:33","date_gmt":"2022-01-16T07:41:33","guid":{"rendered":"https:\/\/www.yuyiares.com\/?p=197"},"modified":"2022-09-30T13:09:42","modified_gmt":"2022-09-30T05:09:42","slug":"bash-%e5%9f%ba%e6%9c%ac%e6%96%87%e6%b3%95%e6%95%99%e5%ad%b8-2","status":"publish","type":"post","link":"https:\/\/www.yuyiares.com\/?p=197","title":{"rendered":"bash – \u57fa\u672c\u6587\u6cd5\u6559\u5b78 #2"},"content":{"rendered":"\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t

\u8ff4\u5708<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t

while<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

bash \u7684\u8ff4\u5708\u5beb\u6cd5\uff0c\u9700\u8981\u900f\u904e “do”\u548c”done”\u5c07\u7a0b\u5f0f\u78bc\u5305\u8986\u8d77\u4f86\u3002<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t
\n\t\t\t\t\t

\u7c21\u55ae\u7bc4\u4f8b<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t
  • \u900f\u904e”let”\u6307\u4ee4\u4f86\u57f7\u884c”i++”\u7684\u904b\u7b97\u5f0f<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
    \n\t\t\t\t
    \n\t\t\t\t\t\t\t\t\t

    i=0
    while (( i<1000 ))
    do
    \u00a0\u00a0\u00a0 echo $i
    \u00a0\u00a0\u00a0 let i++
    done<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

    \n\t\t\t\t
    \n\t\t\t\t\t

    \u7c21\u55ae\u7bc4\u4f8b2<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
    \n\t\t\t\t
    \n\t\t\t\t\t\t\t\t\t

    while ls | grep -q pdf
    do
    \u00a0\u00a0\u00a0 echo -n ‘there is a pdf in :’
    \u00a0\u00a0\u00a0 pwd
    \u00a0\u00a0\u00a0 cd ..
    done<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

    \n\t\t\t\t
    \n\t\t\t\t\t

    \u7c21\u55ae\u7bc4\u4f8b3<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
    \n\t\t\t\t
    \n\t\t\t\t\t\t\t\t\t
    • \u900f\u904e\u8ff4\u5708\u8655\u7406 shell \u7684 \u8f38\u5165\u53c3\u6578($1\u3001$2\u3001$3)<\/span><\/li>
    • ARG \u53ef\u4ee5\u66ff\u63db\u6210\u4efb\u4f55\u8b8a\u6578<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
      \n\t\t\t\t
      \n\t\t\t\t\t\t\t\t\t

      \u00a0for ARG
      do
      \u00a0\u00a0\u00a0\u00a0 echo here is an argument : $ARG
      done<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

      \n\t\t\t\t
      \n\t\t\t\t\t

      \u7c21\u55ae\u7bc4\u4f8b4<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
      \n\t\t\t\t
      \n\t\t\t\t\t\t\t\t\t
      • \u53ef\u4ee5\u76f4\u63a5\u5c07\u8b8a\u6578\u5beb\u5728\u5f8c\u9762<\/span><\/li>
      • \u5206\u5225\u4f9d\u5e8f\u4f9d\u5e8f\u8f38\u51fa”20″\u3001”3″\u3001”dog”\u3001”peach”\u3001”7″\u3001”vanilla”<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
        \n\t\t\t\t
        \n\t\t\t\t\t\t\t\t\t

        For VAL in 20 3 dog peach 7 vanilla
        do
        \u00a0\u00a0\u00a0 exho $VAL
        done<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

        \n\t\t\t\t
        \n\t\t\t\t\t

        \u7c21\u55ae\u7bc4\u4f8b5<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
        \n\t\t\t\t
        \n\t\t\t\t\t\t\t\t\t

        For VAL in $(ls | grep pdf) {0..5}
        do
        \u00a0\u00a0\u00a0 exho $VAL
        done<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

        \n\t\t\t\t
        \n\t\t\t\t\t\t\t
        \n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
        \n\t\t\t\t
        \n\t\t\t\t\t\t\t\t\t

        \u5927\u62ec\u5f27 \u53ef\u4ee5\u7528\u4f86\u7522\u751f\u6578\u5b57<\/span>
        \u5176\u516c\u5f0f \u5982 {first\u2026last\u2026step}<\/span>
        \u5f8c\u9762Step \u90e8\u5206 \u53ef\u6709\u53ef\u7121<\/span>
        first\u6578\u5b57\u90e8\u5206\u53ef\u4ee5\u900f\u904e\u88dc0\u4f86\u78ba\u8a8d\u9577\u5ea6<\/span>
        EX: {050\u2026123}<\/span>
        \u6703\u7522\u751f50~123\u7684\u6578\u5217\uff0c\u4e1450\u7684\u8868\u793a\u65b9\u6cd5\u70ba050<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

        \n\t\t\t\t
        \n\t\t\t\t\t

        \u51fd\u5f0f<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
        \n\t\t\t\t
        \n\t\t\t\t\t

        \u51fd\u5f0f\u8a9e\u6cd5<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
        \n\t\t\t\t
        \n\t\t\t\t\t\t\t\t\t

        function HelloWorld()
        {
        \u00a0\u00a0\u00a0 echo Hello World
        }<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

        \n\t\t\t\t
        \n\t\t\t\t\t\t\t\t\t

        function HelloWorld
        {
        \u00a0\u00a0\u00a0 echo Hello World
        }<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

        \n\t\t\t\t
        \n\t\t\t\t\t\t\t\t\t

        HelloWorld()
        {
        \u00a0\u00a0\u00a0 echo Hello World
        }<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

        \n\t\t\t\t
        \n\t\t\t\t\t

        \u50b3\u905e\u8b8a\u6578<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
        \n\t\t\t\t
        \n\t\t\t\t\t\t\t\t\t
        • \u9664\u975e\u5df2\u5728\u51fd\u5f0f\u4e2d\u5167\u5efa\u6307\u4ee4\u5ba3\u544a\uff0c\u6240\u6709\u8b8a\u6578\u90fd\u662f\u5168\u57df\u8b8a\u6578<\/span><\/li>
        • \u50b3\u905e\u7684\u53c3\u6578\uff0c\u5b9a\u7fa9\u51fd\u6578\u6642\u4e0d\u9700\u8981\u5ba3\u544a\u53c3\u6578<\/span><\/li>
        • \u82e5\u6709\u4e00\u500b subshell \u7684\u51fd\u5f0f\uff0c\u50b3\u7d66\u4ed6\u4e09\u500b\u53c3\u6578\uff0c\u7bc4\u4f8b\u5982\u4e0b<\/span>
          • subshell ‘HELLO WORLD’ \/TEST 123<\/li>
          • \u82e5\u5728 \u51fd\u6578\u9700\u8981\u4f7f\u7528\u6307\u4ee4\u641e\u539f\u672c\u7684\u53c3\u6578\uff0c\u9700\u8981\u5148\u5c07$1\u53c3\u6578 \u5b58\u9032\u8b8a\u6578\u4e2d<\/span>
            • \u5176\u4ed6\u53c3\u6578\u4ee5\u6b64\u985e\u63a8\uff0c\u552f\u4e00\u4f8b\u5916\u3000<\/span>$0<\/code><\/li><\/ul><\/li><\/ul><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
              \n\t\t\t\t
              \n\t\t\t\t\t

              \u56de\u50b3\u503c<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
              \n\t\t\t\t
              \n\t\t\t\t\t\t\t\t\t
              • 0 \u70ba\u6b63\u5e38<\/li>
              • \u975e0 \u70ba\u932f\u8aa4<\/li>
              • \u82e5\u9700\u8981\u56de\u50b3\u8cc7\u6599\uff0c\u8a2d\u7acb\u5168\u57df\u8b8a\u6578\u5373\u53ef
                • \u5728\u51fd\u6578\u4e2d\u5efa\u7acb\u7684\u53c3\u6578\u90fd\u662f\u5168\u57df\u8b8a\u6578<\/li>
                • \u7279\u5225\u5ba3\u544a\u5c40\u90e8\u8b8a\u6578\u9664\u5916<\/li><\/ul><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
                  \n\t\t\t\t
                  \n\t\t\t\t\t

                  \u7ba1\u7dda<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
                  \n\t\t\t\t
                  \n\t\t\t\t\t\t\t\t\t
                  • \u5982\u679c\u51fd\u5f0f\u6703\u5370\u51fa\u7b54\u6848\uff0c\u5fc5\u9808\u628a\u8f38\u51fa\u7576\u6210\u7ba1\u7dda\u7684\u4e00\u90e8\u5206
                    • eg\uff1afunc args | next step | etc<\/li><\/ul><\/li>
                    • \u5c07\u8f38\u51fa\u6355\u6349\u4e0b\u4f86
                      • RETVAL=( myfunc args )<\/li><\/ul><\/li><\/ul>

                        \u5728\u4e0a\u9762\u7684\u60c5\u6cc1\u4e2d\uff0c\u51fd\u5f0f\u90fd\u6703\u88ab\u653e\u5230\u4e00\u500bsubshell\u4e2d\u57f7\u884c\uff0c\u800c\u975e\u4e00\u958b\u59cb\u7684shell\uff0c\u6240\u4ee5\u5728subshell \u4e2d\u7684\u5168\u57df\u8b8a\u6578\u7684\u8b8a\u5316\u90fd\u4e0d\u6703\u53cd\u6620\u5230\u539f\u672c\u7684shell \u4e2d<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

                        \n\t\t\t\t
                        \n\t\t\t\t\t

                        \u6a23\u5f0f\u6bd4\u5c0d<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
                        \n\t\t\t\t
                        \n\t\t\t\t\t\t\t\t\t

                        \u5728\u9700\u8981\u91dd\u5c0d\u5927\u91cf\u6a94\u6848\u9032\u884c\u6307\u540d\u6642\uff0c\u53ef\u4ee5\u900f\u904e Bash \u63d0\u4f9b\u7684\u6a23\u5f0f\u6bd4\u5c0d\u4f86\u9032\u884c\u6578\u500b\u6a94\u6848\u7684\u6307\u540d\u3002<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

                        \n\t\t\t\t
                        \n\t\t\t\t\t

                        \u6bd4\u5c0d\u91cd\u9ede<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
                        \n\t\t\t\t
                        \n\t\t\t\t\t\t\t\t\t
                        • \u6a23\u5f0f\u4e0d\u7b49\u65bc\u6b63\u898f\u5316<\/li>
                        • \u6a23\u5f0f\u662f\u7528\u4f86\u6bd4\u5c0d\u6a94\u540d\u7528 (\u82e5\u6709\u6bd4\u5c0d\u5167\u5bb9\u4e2d\u6709\u8def\u5f91\uff0c\u6bd4\u5c0d\u7bc4\u570d\u50c5\u9650\u76ee\u9304\u4e0b\u7684\u6a94\u6848)<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
                          \n\t\t\t\t
                          \n\t\t\t\t\t

                          \u7279\u6b8a\u6a94\u6848<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
                          \n\t\t\t\t
                          \n\t\t\t\t\t\t\t\t\t
                          • \u00a0echo data > \/tmp\/*.out
                            * \u82e5 tmp \u76ee\u616e\u4e0b\u6709\u7d50\u5c3e\u662f .out \u7684\u6a94\u6848\uff0c \u5c31\u6703\u8f38\u5165\u5230 \u8a72\u9ede\u6848\u88e1\u9762\u3002<\/li>
                          • \u82e5 tmp \u76ee\u7da0\u4e0b\u6c92\u6709\u7d50\u5c3e\u662f .out \u7684\u6a94\u6848\uff0c\u5c31\u6703\u5efa\u7acb\u4e00\u500b *.out \u7684\u6a94\u6848\u3002<\/li>
                          • \u82e5\u8981\u79fb\u9664\u9700\u8981\u8f38\u5165 rm \/tmp\/\\*.out
                            • \u5b57\u5143\u662f\u7279\u6b8a\u5b57\u5143\uff0c\u9700\u8981\u900f\u904e\u53cd\u659c\u7dda\u4f86\u8457\u540d<\/li><\/ul><\/li>
                            • \u6a23\u5f0f\u6bd4\u5c0d \u5c0d\u5f15\u865f\u5167\u7121\u6548(\u5305\u542b\u55ae\u5f15\u865f\u548c\u96d9\u5f15\u865f)
                              • \u6703\u8b1b\u5f15\u865f\u4e2d\u7684\u5167\u5bb9\u7576\u6210\u4e00\u500b\u6a94\u6848<\/li>
                              • echo data > “\/tmp\/*.out”
                                • \u5efa\u7acb\u4e00\u500b\u540d\u5b57\u662f \/tmp\/*.out \u7684\u6a94\u6848<\/li><\/ul><\/li><\/ul><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
                                  \n\t\t\t\t
                                  \n\t\t\t\t\t

                                  \u842c\u7528\u5b57\u5143\uff1a`*`<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
                                  \n\t\t\t\t
                                  \n\t\t\t\t\t\t\t\t\t
                                  • \u53ef\u4ee5\u8868\u9054\u4efb\u610f\u6578\u91cf\u7684\u4efb\u4f55\u5b57\u5143<\/li>
                                  • \u53ef\u4ee5\u548c\u5176\u4ed6\u5b57\u5143\u5408\u4f75<\/li>
                                  • \u8209\u4f8b\uff1a*.pdf \u53ef\u4ee5\u627e\u5230 test.pdf \u548c hello.pdf<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
                                    \n\t\t\t\t
                                    \n\t\t\t\t\t

                                    \u554f\u865f\uff1a`?`<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
                                    \n\t\t\t\t
                                    \n\t\t\t\t\t\t\t\t\t
                                    • \u6bd4\u5c0d\u55ae\u4e00\u5b57\u5143<\/li>
                                    • \u4e00\u500b\u554f\u865f\u5c0d\u61c9\u4e00\u500b\u5b57\u5143<\/li>
                                    • \u8209\u4f8b: ????.pdf \u53ef\u4ee5\u627e\u5230 test.pdf \u4f46\u4e0d\u6703\u627e\u5230 hello.pdf<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
                                      \n\t\t\t\t
                                      \n\t\t\t\t\t

                                      \u4e2d\u62ec\u5f27\uff1a`[]`<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
                                      \n\t\t\t\t
                                      \n\t\t\t\t\t\t\t\t\t

                                      \u6bd4\u5c0d\u4e2d\u62ec\u5f27\u6307\u5b9a\u7684\u689d\u4ef6<\/p>

                                      • [abcd]\uff1a\u91dd\u5c0d\u7279\u5b9a\u55ae\u5b57\uff0c\u53ea\u6709abcd\u9019\u56db\u500b\u55ae\u5b57<\/li>
                                      • [0-9]\uff1a\u91dd\u5c0d\u7279\u5b9a\u7bc4\u570d\uff0c0~9\u7684\u6578\u5b57<\/li>
                                      • [!0-9] or [^0-9]\uff1a\u53cd\u5411\u7b26\u865f\uff0c\u4e0d\u6293\u6709 0~9 \u7684 \u6a94\u6848<\/li>
                                      • [:alnum:]\uff1a\u6578\u5b57\u548c\u5b57\u6bcd\u5b57\u5143<\/li>
                                      • [:alpha:]\uff1a\u7d14\u5b57\u6bcd\u5b57\u5143<\/li>
                                      • [:ascii:]\uff1aASCII \u5b57\u5143<\/li>
                                      • [:blank:]\uff1a\u7a7a\u767d\u548c tab \u5b57\u5143<\/li>
                                      • [:ctrl:]\uff1a\u63a7\u5236\u5b57\u5143<\/li>
                                      • [:digit:]\uff1a\u6578\u5b57\u5b57\u5143<\/li>
                                      • [:graph:]\uff1a\u4efb\u4f55\u63a7\u5236\u548c\u7a7a\u767d\u5b57\u5143\u4ee5\u5916\u7684\u5b57\u5143<\/li>
                                      • [:lower:]\uff1a\u5c0f\u5beb\u5b57\u6bcd<\/li>
                                      • [:print:]\uff1a\u4efb\u4f55\u63a7\u5236\u5b57\u5143\u4ee5\u5916\u7684\u5b57\u5143<\/li>
                                      • [:punct:]\uff1a\u6a19\u9ede\u7b26\u865f\u5b57\u5143<\/li>
                                      • [:space:]\uff1a\u7a7a\u767d\u5b57\u5143(\u5305\u542b\u63db\u884c\u7b26\u865f)<\/li>
                                      • [:upper:]\uff1a\u5927\u5beb\u5b57\u6bcd<\/li>
                                      • [:word:]\uff1a\u5b57\u6bcd\u3001\u6578\u5b57\u548c\u5e95\u7dda\u5b57\u5143<\/li>
                                      • [:xdigit:]\uff1a\u5341\u516d\u9032\u4f4d\u5b57\u5143<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
                                        \n\t\t\t\t
                                        \n\t\t\t\t\t

                                        \u8209\u4f8b<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
                                        \n\t\t\t\t
                                        \n\t\t\t\t\t\t\t\t\t

                                        \u00a0\u8209\u4f8b: [[:punct:]]jpg<\/p>

                                        • \u53ef\u4ee5\u627e\u5230 wow!jpg\u3001some,jpg\u3001photo.jpg<\/li>
                                        • \u4f46\u662f\u627e\u4e0d\u5230 this.is.myjpg (\u56e0\u70bajpg\u6c92\u6709\u6a19\u9ede\u7b26\u865f)<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
                                          \n\t\t\t\t
                                          \n\t\t\t\t\t\t\t
                                          \n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
                                          \n\t\t\t\t
                                          \n\t\t\t\t\t\t\t\t\t

                                          extglob \u82e5\u6709\u9700\u8981\u66f4\u8907\u96dc\uff0c\u53ef\u4ee5\u53bb\u770b\u770b<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

                                          \u8ff4\u5708 while bash \u7684\u8ff4\u5708\u5beb\u6cd5\uff0c\u9700\u8981\u900f\u904e “do”\u548c”done”\u5c07\u7a0b\u5f0f\u78bc\u5305\u8986\u8d77\u4f86\u3002 \u7c21\u55ae\u7bc4\u4f8b \u900f\u904e”let”\u6307\u4ee4\u4f86\u57f7\u884c”i++”\u7684\u904b\u7b97\u5f0f i=0while (( i<1000 ))do \u00a0\u00a0\u00a0 echo $i\u00a0\u00a0\u00a0 let i++done \u7c21\u55ae\u7bc4\u4f8b2 while ls | grep -q pdfdo \u00a0\u00a0\u00a0 echo -n ‘there is a pdf in :’\u00a0\u00a0\u00a0 pwd\u00a0\u00a0\u00a0 cd ..done \u7c21\u55ae\u7bc4\u4f8b3 \u900f\u904e\u8ff4\u5708\u8655\u7406 shell \u7684 \u8f38\u5165\u53c3\u6578($1\u3001$2\u3001$3) ARG \u53ef\u4ee5\u66ff\u63db\u6210\u4efb\u4f55\u8b8a\u6578 \u00a0for ARGdo \u00a0\u00a0\u00a0\u00a0 echo here is an argument : $ARGdone \u7c21\u55ae\u7bc4\u4f8b4 \u53ef\u4ee5\u76f4\u63a5\u5c07\u8b8a\u6578\u5beb\u5728\u5f8c\u9762 \u5206\u5225\u4f9d\u5e8f\u4f9d\u5e8f\u8f38\u51fa”20″\u3001”3″\u3001”dog”\u3001”peach”\u3001”7″\u3001”vanilla” For VAL in 20 3 dog peach 7 vanilla do \u00a0\u00a0\u00a0 exho $VALdone \u7c21\u55ae\u7bc4\u4f8b5 For VAL in $(ls | grep pdf) {0..5}do \u00a0\u00a0\u00a0 exho $VALdone \u5927\u62ec\u5f27 \u53ef\u4ee5\u7528\u4f86\u7522\u751f\u6578\u5b57\u5176\u516c\u5f0f \u5982 {first\u2026last\u2026step}\u5f8c\u9762Step \u90e8\u5206 \u53ef\u6709\u53ef\u7121first\u6578\u5b57\u90e8\u5206\u53ef\u4ee5\u900f\u904e\u88dc0\u4f86\u78ba\u8a8d\u9577\u5ea6EX: {050\u2026123}\u6703\u7522\u751f50~123\u7684\u6578\u5217\uff0c\u4e1450\u7684\u8868\u793a\u65b9\u6cd5\u70ba050 \u51fd\u5f0f \u51fd\u5f0f\u8a9e\u6cd5 function HelloWorld(){\u00a0\u00a0\u00a0 echo Hello World} function HelloWorld{\u00a0\u00a0\u00a0 echo Hello World} HelloWorld(){\u00a0\u00a0\u00a0 echo Hello World} \u50b3\u905e\u8b8a\u6578 \u9664\u975e\u5df2\u5728\u51fd\u5f0f\u4e2d\u5167\u5efa\u6307\u4ee4\u5ba3\u544a\uff0c\u6240\u6709\u8b8a\u6578\u90fd\u662f\u5168\u57df\u8b8a\u6578 \u50b3\u905e\u7684\u53c3\u6578\uff0c\u5b9a\u7fa9\u51fd\u6578\u6642\u4e0d\u9700\u8981\u5ba3\u544a\u53c3\u6578 \u82e5\u6709\u4e00\u500b subshell \u7684\u51fd\u5f0f\uff0c\u50b3\u7d66\u4ed6\u4e09\u500b\u53c3\u6578\uff0c\u7bc4\u4f8b\u5982\u4e0b subshell ‘HELLO WORLD’ \/TEST 123 \u82e5\u5728 \u51fd\u6578\u9700\u8981\u4f7f\u7528\u6307\u4ee4\u641e\u539f\u672c\u7684\u53c3\u6578\uff0c\u9700\u8981\u5148\u5c07$1\u53c3\u6578 \u5b58\u9032\u8b8a\u6578\u4e2d \u5176\u4ed6\u53c3\u6578\u4ee5\u6b64\u985e\u63a8\uff0c\u552f\u4e00\u4f8b\u5916\u3000$0 \u56de\u50b3\u503c 0 \u70ba\u6b63\u5e38 \u975e0 \u70ba\u932f\u8aa4 \u82e5\u9700\u8981\u56de\u50b3\u8cc7\u6599\uff0c\u8a2d\u7acb\u5168\u57df\u8b8a\u6578\u5373\u53ef \u5728\u51fd\u6578\u4e2d\u5efa\u7acb\u7684\u53c3\u6578\u90fd\u662f\u5168\u57df\u8b8a\u6578 \u7279\u5225\u5ba3\u544a\u5c40\u90e8\u8b8a\u6578\u9664\u5916 \u7ba1\u7dda \u5982\u679c\u51fd\u5f0f\u6703\u5370\u51fa\u7b54\u6848\uff0c\u5fc5\u9808\u628a\u8f38\u51fa\u7576\u6210\u7ba1\u7dda\u7684\u4e00\u90e8\u5206 eg\uff1afunc args | next step | etc \u5c07\u8f38\u51fa\u6355\u6349\u4e0b\u4f86 RETVAL=( myfunc args ) \u5728\u4e0a\u9762\u7684\u60c5\u6cc1\u4e2d\uff0c\u51fd\u5f0f\u90fd\u6703\u88ab\u653e\u5230\u4e00\u500bsubshell\u4e2d\u57f7\u884c\uff0c\u800c\u975e\u4e00\u958b\u59cb\u7684shell\uff0c\u6240\u4ee5\u5728subshell \u4e2d\u7684\u5168\u57df\u8b8a\u6578\u7684\u8b8a\u5316\u90fd\u4e0d\u6703\u53cd\u6620\u5230\u539f\u672c\u7684shell \u4e2d \u6a23\u5f0f\u6bd4\u5c0d \u5728\u9700\u8981\u91dd\u5c0d\u5927\u91cf\u6a94\u6848\u9032\u884c\u6307\u540d\u6642\uff0c\u53ef\u4ee5\u900f\u904e Bash \u63d0\u4f9b\u7684\u6a23\u5f0f\u6bd4\u5c0d\u4f86\u9032\u884c\u6578\u500b\u6a94\u6848\u7684\u6307\u540d\u3002 \u6bd4\u5c0d\u91cd\u9ede \u6a23\u5f0f\u4e0d\u7b49\u65bc\u6b63\u898f\u5316 \u6a23\u5f0f\u662f\u7528\u4f86\u6bd4\u5c0d\u6a94\u540d\u7528 (\u82e5\u6709\u6bd4\u5c0d\u5167\u5bb9\u4e2d\u6709\u8def\u5f91\uff0c\u6bd4\u5c0d\u7bc4\u570d\u50c5\u9650\u76ee\u9304\u4e0b\u7684\u6a94\u6848) \u7279\u6b8a\u6a94\u6848 \u00a0echo data > \/tmp\/*.out* \u82e5 tmp \u76ee\u616e\u4e0b\u6709\u7d50\u5c3e\u662f .out \u7684\u6a94\u6848\uff0c \u5c31\u6703\u8f38\u5165\u5230 \u8a72\u9ede\u6848\u88e1\u9762\u3002 \u82e5 tmp \u76ee\u7da0\u4e0b\u6c92\u6709\u7d50\u5c3e\u662f .out \u7684\u6a94\u6848\uff0c\u5c31\u6703\u5efa\u7acb\u4e00\u500b *.out \u7684\u6a94\u6848\u3002 \u82e5\u8981\u79fb\u9664\u9700\u8981\u8f38\u5165 rm \/tmp\/*.out \u5b57\u5143\u662f\u7279\u6b8a\u5b57\u5143\uff0c\u9700\u8981\u900f\u904e\u53cd\u659c\u7dda\u4f86\u8457\u540d \u6a23\u5f0f\u6bd4\u5c0d \u5c0d\u5f15\u865f\u5167\u7121\u6548(\u5305\u542b\u55ae\u5f15\u865f\u548c\u96d9\u5f15\u865f) \u6703\u8b1b\u5f15\u865f\u4e2d\u7684\u5167\u5bb9\u7576\u6210\u4e00\u500b\u6a94\u6848 echo data > “\/tmp\/*.out” \u5efa\u7acb\u4e00\u500b\u540d\u5b57\u662f \/tmp\/*.out \u7684\u6a94\u6848 \u842c\u7528\u5b57\u5143\uff1a`*` \u53ef\u4ee5\u8868\u9054\u4efb\u610f\u6578\u91cf\u7684\u4efb\u4f55\u5b57\u5143 \u53ef\u4ee5\u548c\u5176\u4ed6\u5b57\u5143\u5408\u4f75 \u8209\u4f8b\uff1a*.pdf \u53ef\u4ee5\u627e\u5230 test.pdf \u548c hello.pdf \u554f\u865f\uff1a`?` \u6bd4\u5c0d\u55ae\u4e00\u5b57\u5143 \u4e00\u500b\u554f\u865f\u5c0d\u61c9\u4e00\u500b\u5b57\u5143 \u8209\u4f8b: ????.pdf \u53ef\u4ee5\u627e\u5230 test.pdf \u4f46\u4e0d\u6703\u627e\u5230 hello.pdf \u4e2d\u62ec\u5f27\uff1a`[]` \u6bd4\u5c0d\u4e2d\u62ec\u5f27\u6307\u5b9a\u7684\u689d\u4ef6 [abcd]\uff1a\u91dd\u5c0d\u7279\u5b9a\u55ae\u5b57\uff0c\u53ea\u6709abcd\u9019\u56db\u500b\u55ae\u5b57 [0-9]\uff1a\u91dd\u5c0d\u7279\u5b9a\u7bc4\u570d\uff0c0~9\u7684\u6578\u5b57 [!0-9] or [^0-9]\uff1a\u53cd\u5411\u7b26\u865f\uff0c\u4e0d\u6293\u6709 0~9 \u7684 \u6a94\u6848 [:alnum:]\uff1a\u6578\u5b57\u548c\u5b57\u6bcd\u5b57\u5143 [:alpha:]\uff1a\u7d14\u5b57\u6bcd\u5b57\u5143 [:ascii:]\uff1aASCII \u5b57\u5143 [:blank:]\uff1a\u7a7a\u767d\u548c tab \u5b57\u5143 [:ctrl:]\uff1a\u63a7\u5236\u5b57\u5143 [:digit:]\uff1a\u6578\u5b57\u5b57\u5143 [:graph:]\uff1a\u4efb\u4f55\u63a7\u5236\u548c\u7a7a\u767d\u5b57\u5143\u4ee5\u5916\u7684\u5b57\u5143 [:lower:]\uff1a\u5c0f\u5beb…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[17,5],"tags":[],"class_list":["post-197","post","type-post","status-publish","format-standard","hentry","category-bash","category-research-study"],"yoast_head":"\nbash - \u57fa\u672c\u6587\u6cd5\u6559\u5b78 #2 - Ares Vlog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.yuyiares.com\/?p=197\" \/>\n<meta property=\"og:locale\" content=\"zh_TW\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"bash - \u57fa\u672c\u6587\u6cd5\u6559\u5b78 #2 - Ares Vlog\" \/>\n<meta property=\"og:description\" content=\"\u8ff4\u5708 while bash \u7684\u8ff4\u5708\u5beb\u6cd5\uff0c\u9700\u8981\u900f\u904e “do”\u548c”done”\u5c07\u7a0b\u5f0f\u78bc\u5305\u8986\u8d77\u4f86\u3002 \u7c21\u55ae\u7bc4\u4f8b \u900f\u904e”let”\u6307\u4ee4\u4f86\u57f7\u884c”i++”\u7684\u904b\u7b97\u5f0f i=0while (( i<1000 ))do \u00a0\u00a0\u00a0 echo $i\u00a0\u00a0\u00a0 let i++done \u7c21\u55ae\u7bc4\u4f8b2 while ls | grep -q pdfdo \u00a0\u00a0\u00a0 echo -n ‘there is a pdf in :’\u00a0\u00a0\u00a0 pwd\u00a0\u00a0\u00a0 cd ..done \u7c21\u55ae\u7bc4\u4f8b3 \u900f\u904e\u8ff4\u5708\u8655\u7406 shell \u7684 \u8f38\u5165\u53c3\u6578($1\u3001$2\u3001$3) ARG \u53ef\u4ee5\u66ff\u63db\u6210\u4efb\u4f55\u8b8a\u6578 \u00a0for ARGdo \u00a0\u00a0\u00a0\u00a0 echo here is an argument : $ARGdone \u7c21\u55ae\u7bc4\u4f8b4 \u53ef\u4ee5\u76f4\u63a5\u5c07\u8b8a\u6578\u5beb\u5728\u5f8c\u9762 \u5206\u5225\u4f9d\u5e8f\u4f9d\u5e8f\u8f38\u51fa”20″\u3001”3″\u3001”dog”\u3001”peach”\u3001”7″\u3001”vanilla” For VAL in 20 3 dog peach 7 vanilla do \u00a0\u00a0\u00a0 exho $VALdone \u7c21\u55ae\u7bc4\u4f8b5 For VAL in $(ls | grep pdf) {0..5}do \u00a0\u00a0\u00a0 exho $VALdone \u5927\u62ec\u5f27 \u53ef\u4ee5\u7528\u4f86\u7522\u751f\u6578\u5b57\u5176\u516c\u5f0f \u5982 {first\u2026last\u2026step}\u5f8c\u9762Step \u90e8\u5206 \u53ef\u6709\u53ef\u7121first\u6578\u5b57\u90e8\u5206\u53ef\u4ee5\u900f\u904e\u88dc0\u4f86\u78ba\u8a8d\u9577\u5ea6EX: {050\u2026123}\u6703\u7522\u751f50~123\u7684\u6578\u5217\uff0c\u4e1450\u7684\u8868\u793a\u65b9\u6cd5\u70ba050 \u51fd\u5f0f \u51fd\u5f0f\u8a9e\u6cd5 function HelloWorld(){\u00a0\u00a0\u00a0 echo Hello World} function HelloWorld{\u00a0\u00a0\u00a0 echo Hello World} HelloWorld(){\u00a0\u00a0\u00a0 echo Hello World} \u50b3\u905e\u8b8a\u6578 \u9664\u975e\u5df2\u5728\u51fd\u5f0f\u4e2d\u5167\u5efa\u6307\u4ee4\u5ba3\u544a\uff0c\u6240\u6709\u8b8a\u6578\u90fd\u662f\u5168\u57df\u8b8a\u6578 \u50b3\u905e\u7684\u53c3\u6578\uff0c\u5b9a\u7fa9\u51fd\u6578\u6642\u4e0d\u9700\u8981\u5ba3\u544a\u53c3\u6578 \u82e5\u6709\u4e00\u500b subshell \u7684\u51fd\u5f0f\uff0c\u50b3\u7d66\u4ed6\u4e09\u500b\u53c3\u6578\uff0c\u7bc4\u4f8b\u5982\u4e0b subshell ‘HELLO WORLD’ \/TEST 123 \u82e5\u5728 \u51fd\u6578\u9700\u8981\u4f7f\u7528\u6307\u4ee4\u641e\u539f\u672c\u7684\u53c3\u6578\uff0c\u9700\u8981\u5148\u5c07$1\u53c3\u6578 \u5b58\u9032\u8b8a\u6578\u4e2d \u5176\u4ed6\u53c3\u6578\u4ee5\u6b64\u985e\u63a8\uff0c\u552f\u4e00\u4f8b\u5916\u3000$0 \u56de\u50b3\u503c 0 \u70ba\u6b63\u5e38 \u975e0 \u70ba\u932f\u8aa4 \u82e5\u9700\u8981\u56de\u50b3\u8cc7\u6599\uff0c\u8a2d\u7acb\u5168\u57df\u8b8a\u6578\u5373\u53ef \u5728\u51fd\u6578\u4e2d\u5efa\u7acb\u7684\u53c3\u6578\u90fd\u662f\u5168\u57df\u8b8a\u6578 \u7279\u5225\u5ba3\u544a\u5c40\u90e8\u8b8a\u6578\u9664\u5916 \u7ba1\u7dda \u5982\u679c\u51fd\u5f0f\u6703\u5370\u51fa\u7b54\u6848\uff0c\u5fc5\u9808\u628a\u8f38\u51fa\u7576\u6210\u7ba1\u7dda\u7684\u4e00\u90e8\u5206 eg\uff1afunc args | next step | etc \u5c07\u8f38\u51fa\u6355\u6349\u4e0b\u4f86 RETVAL=( myfunc args ) \u5728\u4e0a\u9762\u7684\u60c5\u6cc1\u4e2d\uff0c\u51fd\u5f0f\u90fd\u6703\u88ab\u653e\u5230\u4e00\u500bsubshell\u4e2d\u57f7\u884c\uff0c\u800c\u975e\u4e00\u958b\u59cb\u7684shell\uff0c\u6240\u4ee5\u5728subshell \u4e2d\u7684\u5168\u57df\u8b8a\u6578\u7684\u8b8a\u5316\u90fd\u4e0d\u6703\u53cd\u6620\u5230\u539f\u672c\u7684shell \u4e2d \u6a23\u5f0f\u6bd4\u5c0d \u5728\u9700\u8981\u91dd\u5c0d\u5927\u91cf\u6a94\u6848\u9032\u884c\u6307\u540d\u6642\uff0c\u53ef\u4ee5\u900f\u904e Bash \u63d0\u4f9b\u7684\u6a23\u5f0f\u6bd4\u5c0d\u4f86\u9032\u884c\u6578\u500b\u6a94\u6848\u7684\u6307\u540d\u3002 \u6bd4\u5c0d\u91cd\u9ede \u6a23\u5f0f\u4e0d\u7b49\u65bc\u6b63\u898f\u5316 \u6a23\u5f0f\u662f\u7528\u4f86\u6bd4\u5c0d\u6a94\u540d\u7528 (\u82e5\u6709\u6bd4\u5c0d\u5167\u5bb9\u4e2d\u6709\u8def\u5f91\uff0c\u6bd4\u5c0d\u7bc4\u570d\u50c5\u9650\u76ee\u9304\u4e0b\u7684\u6a94\u6848) \u7279\u6b8a\u6a94\u6848 \u00a0echo data > \/tmp\/*.out* \u82e5 tmp \u76ee\u616e\u4e0b\u6709\u7d50\u5c3e\u662f .out \u7684\u6a94\u6848\uff0c \u5c31\u6703\u8f38\u5165\u5230 \u8a72\u9ede\u6848\u88e1\u9762\u3002 \u82e5 tmp \u76ee\u7da0\u4e0b\u6c92\u6709\u7d50\u5c3e\u662f .out \u7684\u6a94\u6848\uff0c\u5c31\u6703\u5efa\u7acb\u4e00\u500b *.out \u7684\u6a94\u6848\u3002 \u82e5\u8981\u79fb\u9664\u9700\u8981\u8f38\u5165 rm \/tmp\/*.out \u5b57\u5143\u662f\u7279\u6b8a\u5b57\u5143\uff0c\u9700\u8981\u900f\u904e\u53cd\u659c\u7dda\u4f86\u8457\u540d \u6a23\u5f0f\u6bd4\u5c0d \u5c0d\u5f15\u865f\u5167\u7121\u6548(\u5305\u542b\u55ae\u5f15\u865f\u548c\u96d9\u5f15\u865f) \u6703\u8b1b\u5f15\u865f\u4e2d\u7684\u5167\u5bb9\u7576\u6210\u4e00\u500b\u6a94\u6848 echo data > “\/tmp\/*.out” \u5efa\u7acb\u4e00\u500b\u540d\u5b57\u662f \/tmp\/*.out \u7684\u6a94\u6848 \u842c\u7528\u5b57\u5143\uff1a`*` \u53ef\u4ee5\u8868\u9054\u4efb\u610f\u6578\u91cf\u7684\u4efb\u4f55\u5b57\u5143 \u53ef\u4ee5\u548c\u5176\u4ed6\u5b57\u5143\u5408\u4f75 \u8209\u4f8b\uff1a*.pdf \u53ef\u4ee5\u627e\u5230 test.pdf \u548c hello.pdf \u554f\u865f\uff1a`?` \u6bd4\u5c0d\u55ae\u4e00\u5b57\u5143 \u4e00\u500b\u554f\u865f\u5c0d\u61c9\u4e00\u500b\u5b57\u5143 \u8209\u4f8b: ????.pdf \u53ef\u4ee5\u627e\u5230 test.pdf \u4f46\u4e0d\u6703\u627e\u5230 hello.pdf \u4e2d\u62ec\u5f27\uff1a`[]` \u6bd4\u5c0d\u4e2d\u62ec\u5f27\u6307\u5b9a\u7684\u689d\u4ef6 [abcd]\uff1a\u91dd\u5c0d\u7279\u5b9a\u55ae\u5b57\uff0c\u53ea\u6709abcd\u9019\u56db\u500b\u55ae\u5b57 [0-9]\uff1a\u91dd\u5c0d\u7279\u5b9a\u7bc4\u570d\uff0c0~9\u7684\u6578\u5b57 [!0-9] or [^0-9]\uff1a\u53cd\u5411\u7b26\u865f\uff0c\u4e0d\u6293\u6709 0~9 \u7684 \u6a94\u6848 [:alnum:]\uff1a\u6578\u5b57\u548c\u5b57\u6bcd\u5b57\u5143 [:alpha:]\uff1a\u7d14\u5b57\u6bcd\u5b57\u5143 [:ascii:]\uff1aASCII \u5b57\u5143 [:blank:]\uff1a\u7a7a\u767d\u548c tab \u5b57\u5143 [:ctrl:]\uff1a\u63a7\u5236\u5b57\u5143 [:digit:]\uff1a\u6578\u5b57\u5b57\u5143 [:graph:]\uff1a\u4efb\u4f55\u63a7\u5236\u548c\u7a7a\u767d\u5b57\u5143\u4ee5\u5916\u7684\u5b57\u5143 [:lower:]\uff1a\u5c0f\u5beb...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.yuyiares.com\/?p=197\" \/>\n<meta property=\"og:site_name\" content=\"Ares Vlog\" \/>\n<meta property=\"article:published_time\" content=\"2022-01-16T07:41:33+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-09-30T05:09:42+00:00\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005:\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9810\u4f30\u95b1\u8b80\u6642\u9593\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 \u5206\u9418\" \/>\n<script type=\"application\/ld+json\" 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\/ Yoast SEO plugin. -->","yoast_head_json":{"title":"bash - \u57fa\u672c\u6587\u6cd5\u6559\u5b78 #2 - Ares Vlog","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.yuyiares.com\/?p=197","og_locale":"zh_TW","og_type":"article","og_title":"bash - \u57fa\u672c\u6587\u6cd5\u6559\u5b78 #2 - Ares Vlog","og_description":"\u8ff4\u5708 while bash \u7684\u8ff4\u5708\u5beb\u6cd5\uff0c\u9700\u8981\u900f\u904e “do”\u548c”done”\u5c07\u7a0b\u5f0f\u78bc\u5305\u8986\u8d77\u4f86\u3002 \u7c21\u55ae\u7bc4\u4f8b \u900f\u904e”let”\u6307\u4ee4\u4f86\u57f7\u884c”i++”\u7684\u904b\u7b97\u5f0f i=0while (( i<1000 ))do \u00a0\u00a0\u00a0 echo $i\u00a0\u00a0\u00a0 let i++done \u7c21\u55ae\u7bc4\u4f8b2 while ls | grep -q pdfdo \u00a0\u00a0\u00a0 echo -n ‘there is a pdf in :’\u00a0\u00a0\u00a0 pwd\u00a0\u00a0\u00a0 cd ..done \u7c21\u55ae\u7bc4\u4f8b3 \u900f\u904e\u8ff4\u5708\u8655\u7406 shell \u7684 \u8f38\u5165\u53c3\u6578($1\u3001$2\u3001$3) ARG \u53ef\u4ee5\u66ff\u63db\u6210\u4efb\u4f55\u8b8a\u6578 \u00a0for ARGdo \u00a0\u00a0\u00a0\u00a0 echo here is an argument : $ARGdone \u7c21\u55ae\u7bc4\u4f8b4 \u53ef\u4ee5\u76f4\u63a5\u5c07\u8b8a\u6578\u5beb\u5728\u5f8c\u9762 \u5206\u5225\u4f9d\u5e8f\u4f9d\u5e8f\u8f38\u51fa”20″\u3001”3″\u3001”dog”\u3001”peach”\u3001”7″\u3001”vanilla” For VAL in 20 3 dog peach 7 vanilla do \u00a0\u00a0\u00a0 exho $VALdone \u7c21\u55ae\u7bc4\u4f8b5 For VAL in $(ls | grep pdf) {0..5}do \u00a0\u00a0\u00a0 exho $VALdone \u5927\u62ec\u5f27 \u53ef\u4ee5\u7528\u4f86\u7522\u751f\u6578\u5b57\u5176\u516c\u5f0f \u5982 {first\u2026last\u2026step}\u5f8c\u9762Step \u90e8\u5206 \u53ef\u6709\u53ef\u7121first\u6578\u5b57\u90e8\u5206\u53ef\u4ee5\u900f\u904e\u88dc0\u4f86\u78ba\u8a8d\u9577\u5ea6EX: {050\u2026123}\u6703\u7522\u751f50~123\u7684\u6578\u5217\uff0c\u4e1450\u7684\u8868\u793a\u65b9\u6cd5\u70ba050 \u51fd\u5f0f \u51fd\u5f0f\u8a9e\u6cd5 function HelloWorld(){\u00a0\u00a0\u00a0 echo Hello World} function HelloWorld{\u00a0\u00a0\u00a0 echo Hello World} HelloWorld(){\u00a0\u00a0\u00a0 echo Hello World} \u50b3\u905e\u8b8a\u6578 \u9664\u975e\u5df2\u5728\u51fd\u5f0f\u4e2d\u5167\u5efa\u6307\u4ee4\u5ba3\u544a\uff0c\u6240\u6709\u8b8a\u6578\u90fd\u662f\u5168\u57df\u8b8a\u6578 \u50b3\u905e\u7684\u53c3\u6578\uff0c\u5b9a\u7fa9\u51fd\u6578\u6642\u4e0d\u9700\u8981\u5ba3\u544a\u53c3\u6578 \u82e5\u6709\u4e00\u500b subshell \u7684\u51fd\u5f0f\uff0c\u50b3\u7d66\u4ed6\u4e09\u500b\u53c3\u6578\uff0c\u7bc4\u4f8b\u5982\u4e0b subshell ‘HELLO WORLD’ \/TEST 123 \u82e5\u5728 \u51fd\u6578\u9700\u8981\u4f7f\u7528\u6307\u4ee4\u641e\u539f\u672c\u7684\u53c3\u6578\uff0c\u9700\u8981\u5148\u5c07$1\u53c3\u6578 \u5b58\u9032\u8b8a\u6578\u4e2d \u5176\u4ed6\u53c3\u6578\u4ee5\u6b64\u985e\u63a8\uff0c\u552f\u4e00\u4f8b\u5916\u3000$0 \u56de\u50b3\u503c 0 \u70ba\u6b63\u5e38 \u975e0 \u70ba\u932f\u8aa4 \u82e5\u9700\u8981\u56de\u50b3\u8cc7\u6599\uff0c\u8a2d\u7acb\u5168\u57df\u8b8a\u6578\u5373\u53ef \u5728\u51fd\u6578\u4e2d\u5efa\u7acb\u7684\u53c3\u6578\u90fd\u662f\u5168\u57df\u8b8a\u6578 \u7279\u5225\u5ba3\u544a\u5c40\u90e8\u8b8a\u6578\u9664\u5916 \u7ba1\u7dda \u5982\u679c\u51fd\u5f0f\u6703\u5370\u51fa\u7b54\u6848\uff0c\u5fc5\u9808\u628a\u8f38\u51fa\u7576\u6210\u7ba1\u7dda\u7684\u4e00\u90e8\u5206 eg\uff1afunc args | next step | etc \u5c07\u8f38\u51fa\u6355\u6349\u4e0b\u4f86 RETVAL=( myfunc args ) \u5728\u4e0a\u9762\u7684\u60c5\u6cc1\u4e2d\uff0c\u51fd\u5f0f\u90fd\u6703\u88ab\u653e\u5230\u4e00\u500bsubshell\u4e2d\u57f7\u884c\uff0c\u800c\u975e\u4e00\u958b\u59cb\u7684shell\uff0c\u6240\u4ee5\u5728subshell \u4e2d\u7684\u5168\u57df\u8b8a\u6578\u7684\u8b8a\u5316\u90fd\u4e0d\u6703\u53cd\u6620\u5230\u539f\u672c\u7684shell \u4e2d \u6a23\u5f0f\u6bd4\u5c0d \u5728\u9700\u8981\u91dd\u5c0d\u5927\u91cf\u6a94\u6848\u9032\u884c\u6307\u540d\u6642\uff0c\u53ef\u4ee5\u900f\u904e Bash \u63d0\u4f9b\u7684\u6a23\u5f0f\u6bd4\u5c0d\u4f86\u9032\u884c\u6578\u500b\u6a94\u6848\u7684\u6307\u540d\u3002 \u6bd4\u5c0d\u91cd\u9ede \u6a23\u5f0f\u4e0d\u7b49\u65bc\u6b63\u898f\u5316 \u6a23\u5f0f\u662f\u7528\u4f86\u6bd4\u5c0d\u6a94\u540d\u7528 (\u82e5\u6709\u6bd4\u5c0d\u5167\u5bb9\u4e2d\u6709\u8def\u5f91\uff0c\u6bd4\u5c0d\u7bc4\u570d\u50c5\u9650\u76ee\u9304\u4e0b\u7684\u6a94\u6848) \u7279\u6b8a\u6a94\u6848 \u00a0echo data > \/tmp\/*.out* \u82e5 tmp \u76ee\u616e\u4e0b\u6709\u7d50\u5c3e\u662f .out \u7684\u6a94\u6848\uff0c \u5c31\u6703\u8f38\u5165\u5230 \u8a72\u9ede\u6848\u88e1\u9762\u3002 \u82e5 tmp \u76ee\u7da0\u4e0b\u6c92\u6709\u7d50\u5c3e\u662f .out \u7684\u6a94\u6848\uff0c\u5c31\u6703\u5efa\u7acb\u4e00\u500b *.out \u7684\u6a94\u6848\u3002 \u82e5\u8981\u79fb\u9664\u9700\u8981\u8f38\u5165 rm \/tmp\/*.out \u5b57\u5143\u662f\u7279\u6b8a\u5b57\u5143\uff0c\u9700\u8981\u900f\u904e\u53cd\u659c\u7dda\u4f86\u8457\u540d \u6a23\u5f0f\u6bd4\u5c0d \u5c0d\u5f15\u865f\u5167\u7121\u6548(\u5305\u542b\u55ae\u5f15\u865f\u548c\u96d9\u5f15\u865f) \u6703\u8b1b\u5f15\u865f\u4e2d\u7684\u5167\u5bb9\u7576\u6210\u4e00\u500b\u6a94\u6848 echo data > “\/tmp\/*.out” \u5efa\u7acb\u4e00\u500b\u540d\u5b57\u662f \/tmp\/*.out \u7684\u6a94\u6848 \u842c\u7528\u5b57\u5143\uff1a`*` \u53ef\u4ee5\u8868\u9054\u4efb\u610f\u6578\u91cf\u7684\u4efb\u4f55\u5b57\u5143 \u53ef\u4ee5\u548c\u5176\u4ed6\u5b57\u5143\u5408\u4f75 \u8209\u4f8b\uff1a*.pdf \u53ef\u4ee5\u627e\u5230 test.pdf \u548c hello.pdf \u554f\u865f\uff1a`?` \u6bd4\u5c0d\u55ae\u4e00\u5b57\u5143 \u4e00\u500b\u554f\u865f\u5c0d\u61c9\u4e00\u500b\u5b57\u5143 \u8209\u4f8b: ????.pdf \u53ef\u4ee5\u627e\u5230 test.pdf \u4f46\u4e0d\u6703\u627e\u5230 hello.pdf \u4e2d\u62ec\u5f27\uff1a`[]` \u6bd4\u5c0d\u4e2d\u62ec\u5f27\u6307\u5b9a\u7684\u689d\u4ef6 [abcd]\uff1a\u91dd\u5c0d\u7279\u5b9a\u55ae\u5b57\uff0c\u53ea\u6709abcd\u9019\u56db\u500b\u55ae\u5b57 [0-9]\uff1a\u91dd\u5c0d\u7279\u5b9a\u7bc4\u570d\uff0c0~9\u7684\u6578\u5b57 [!0-9] or [^0-9]\uff1a\u53cd\u5411\u7b26\u865f\uff0c\u4e0d\u6293\u6709 0~9 \u7684 \u6a94\u6848 [:alnum:]\uff1a\u6578\u5b57\u548c\u5b57\u6bcd\u5b57\u5143 [:alpha:]\uff1a\u7d14\u5b57\u6bcd\u5b57\u5143 [:ascii:]\uff1aASCII \u5b57\u5143 [:blank:]\uff1a\u7a7a\u767d\u548c tab \u5b57\u5143 [:ctrl:]\uff1a\u63a7\u5236\u5b57\u5143 [:digit:]\uff1a\u6578\u5b57\u5b57\u5143 [:graph:]\uff1a\u4efb\u4f55\u63a7\u5236\u548c\u7a7a\u767d\u5b57\u5143\u4ee5\u5916\u7684\u5b57\u5143 [:lower:]\uff1a\u5c0f\u5beb...","og_url":"https:\/\/www.yuyiares.com\/?p=197","og_site_name":"Ares Vlog","article_published_time":"2022-01-16T07:41:33+00:00","article_modified_time":"2022-09-30T05:09:42+00:00","author":"admin","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005:":"admin","\u9810\u4f30\u95b1\u8b80\u6642\u9593":"2 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