{"id":185,"date":"2021-12-22T16:00:56","date_gmt":"2021-12-22T08:00:56","guid":{"rendered":"https:\/\/www.yuyiares.com\/?p=185"},"modified":"2022-09-30T13:11:02","modified_gmt":"2022-09-30T05:11:02","slug":"bash-%e5%9f%ba%e6%9c%ac%e6%96%87%e6%b3%95%e6%95%99%e5%ad%b8-1","status":"publish","type":"post","link":"https:\/\/www.yuyiares.com\/?p=185","title":{"rendered":"bash – \u57fa\u672c\u6587\u6cd5\u6559\u5b78 #1"},"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\t\t\t\t

bash \u662f\u4e00\u500b\u547d\u4ee4\u8655\u7406\u5668\uff0c\u901a\u5e38\u57f7\u884c\u5728CLI\u4ecb\u9762\u3002\u901a\u5e38\u6211\u5011\u90fd\u6703\u90fd\u6703BASH \u4f86\u64b0\u5beb\u6307\u4ee4\u78bc\uff0c\u5728\u5f88\u591a\u6642\u5019\u6703\u975e\u5e38\u65b9\u4fbf\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

\u8f38\u51fa<\/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

\u8f38\u51fa\u90e8\u5206\u8ddf\u5f88\u591a\u7a0b\u5f0f\u4e00\u6a23\u3002\u53ef\u4ee5\u900f\u904e”echo”\u548c”printf”\u4f86\u8f38\u51fa\u6a94\u6848\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

echo<\/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

$ echo “Hello World”<\/p>

\u00a0<\/p>


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

echo \u6703\u5728\u5b57\u4e32\u5f8c\u9762\u52a0\u4e0a\u63db\u884c\u5b57\u7b26<\/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

prinrf<\/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

$ printf “Hello World\\n” <\/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

\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

\u8b8a\u6578\u90e8\u5206\u4e5f\u662f\u8ddf\u7a0b\u5f0f\u5beb\u6cd5\u4e00\u6a23\uff0c\u4e0d\u904e\u9700\u8981\u6ce8\u610f\u7684\u662f\u9700\u53c8\u900f\u904e”$”\u5b57\u5143\u624d\u80fd\u5920\u5c07\u8b8a\u6578\u88e1\u9762\u7684\u503c\u53d6\u51fa\u3002\u53e6\u5916\u4e5f\u9700\u8981\u6ce8\u610f\u8b8a\u6578\u88e1\u9762\u7684\u578b\u614b\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

\u8ce6\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

Greetings=Hello<\/p>

\u00a0<\/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

\u53d6\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

\u900f\u904e $\u5b57\u5143 \u5c07\u8b8a\u6578\u7684\u503c\u53d6\u51fa\u4f86<\/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

echo $Greetings<\/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

\u55ae\u5f15\u865f & \u96d9\u5f15\u865f<\/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

\u82e5\u6709\u591a\u500b\u7684\u55ae\u5b57\uff0c\u9700\u8981\u7528\u55ae\u5f15\u865f\u5305\u8d77\u4f86<\/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

Greeting=’only for words’<\/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

\u82e5\u9700\u8981\u4f7f\u7528\u8b8a\u6578\u529f\u80fd\uff0c\u5247\u9700\u8981\u7528\u96d9\u5f15\u865f\u5305\u8d77\u4f86<\/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

Greeting2= “if want to use variable”<\/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

\u7528\u96d9\u5f15\u865f(“)\uff0c\u4efb\u4f55$\u5b57\u5143\u958b\u982d\u7684\u90e8\u5206\u90fd\u6703\u88ab\u66ff\u63db<\/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

\u4f4d\u7f6e\u53c3\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

\u82e5\u8981\u53d6\u7684\u53d6\u5f97\u7684\u53c3\u6578\uff0c\u53ef\u4ee5\u900f\u904e $\u5b57\u5143 +\u6578\u5b57\u4f86\u53d6\u5f97\u53c3\u6578
$0 \u5247\u6703\u53d6\u5f97\u6307\u4ee4\u641e\u7684\u540d\u7a31
$# \u5247\u6703\u53d6\u5f97\u8a72\u6307\u4ee4\u641e\u5728\u57f7\u884c\u6642\uff0c\u8f38\u5165\u7684\u53c3\u6578\u6578\u91cf
\u7bc4\u4f8b\u6307\u4ee4\u641e\u5982\u4e0b\u6240\u793a<\/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

#!\/bin\/bash –
# test02.sh<\/p>

echo $1
echo $2
echo $3
echo $0
echo $#<\/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

\u53ef\u4ee5\u900f\u904e$ \u4f86\u5206\u5225\u53d6\u5f97\u53c3\u6578\u3001\u6307\u4ee4\u641e\u540d\u7a31\u3001\u53c3\u6578\u6578\u91cf

<\/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

$ .\/test02.sh\u00a0 hello world ??<\/p>

\u00a0<\/div>
\u00a0<\/div>

hello
world
??
.\/test02.sh
3

<\/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

\u8f38\u51fa<\/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 \u900f\u904e read \u8b80\u53d6\u8f38\u5165\uff0c\u4ed6\u6703\u5f9e stdin \u4f86\u63a5\u6536\u4f7f\u7528\u8005\u7684\u8f38\u5165\uff0c\u518d\u5b58\u5728\u6307\u5b9a\u7684\u8b8a\u6578\u88e1\u9762<\/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

read data<\/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

\u4e5f\u53ef\u4ee5\u900f\u904e read \u4f86\u9054\u5230\u7a0b\u5f0f\u66ab\u505c\u7684\u529f\u80fd<\/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

\n# \u689d\u4ef6\u5224\u65b7<\/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

\u4efb\u4f55\u5728 bash \u4e2d\u5f15\u7528\u7684\u6307\u4ee4\u6216\u662f\u7a0b\u5f0f\uff0c\u53ef\u80fd\u90fd\u6703\u7522\u751f\u8f38\u51fa\uff0c\u4f46\u4e5f\u6703\u50b3\u56de\u4e00\u500b\u4ee3\u8868\u6210\u529f\u6216\u662f\u5931\u6557\u7684\u503c\u3002
\u00a0\u5728 shell \u4e2d\uff0c\u53ea\u8981\u662f\u525b\u525b\u57f7\u884c\u7684\u6307\u4ee4(\u9084\u672a\u57f7\u884c\u4e0b\u4e00\u500b\u6307\u4ee4\u524d)\uff0c\u90fd\u53ef\u4ee5\u900f\u904e $? \u8b8a\u6578\u53d6\u5f97\u72c0\u614b\u3002
\u00a00 \u4ee3\u8868\u6210\u529f\u3001\u70ba\u771f \uff0c\u4efb\u4f55\u975e 0 \u503c\u4ee3\u8868\u5931\u6557\u3001\u70ba\u5047<\/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

if condition
then
\u00a0\u00a0\u00a0 actions
elif condition2
then
\u00a0\u00a0\u00a0 actions2
else
\u00a0\u00a0\u00a0 other
fi<\/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

\u6307\u4ee4 + \u689d\u4ef6<\/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

if cd \/test
then
\u00a0\u00a0\u00a0 echo “the thing in \/test”
\u00a0\u00a0\u00a0 ls -l
fi<\/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

\u7ba1\u7dda\u4e32\u6d41<\/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

if ls | gerp pdf
then
\u00a0\u00a0\u00a0 echo “have pdf”
else
\u00a0\u00a0\u00a0 echo “no pdf”
fi<\/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

\u4f46\u9700\u8981\u6ce8\u610f\uff0c\u82e5\u4f7f\u7528\u7ba1\u7dda\uff0c\u5247\u6703\u4ee5\u6700\u5f8c\u4e00\u689d\u6307\u4ee4\u7684\u6210\u529f\u8207\u5426\u4f86\u5224\u65b7\u3002
\u4e0b\u5217\u7bc4\u4f8b\u4e0d\u7ba1\u6709\u6c92\u6709\u627e\u5230 pdf \uff0c\u90fd\u6703\u8f38\u51fa “have pdf”<\/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

#!\/bin\/bash –<\/p>

if ls | grep pdf | echo ‘1’
then
\u00a0\u00a0\u00a0 echo “have pdf”
else
\u00a0\u00a0\u00a0 echo “no pdf”
fi<\/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

\u8907\u5408\u5f0f\u6307\u4ee4 (\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\tif [[ -e $FILENAME]]
then
    echo $FILENAME exists
fi
\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
  • -d \u6e2c\u8a66\u76ee\u9304\u662f\u5426\u5b58\u5728<\/li>
  • -e \u6e2c\u8a66\u6a94\u6848\u662f\u5426\u5b58\u8f09<\/li>
  • -r \u6e2c\u8a66\u6a94\u6848\u662f\u5426\u53ef\u4ee5\u8b80\u53d6<\/li>
  • -w \u6e2c\u8a66\u6a94\u6848\u662f\u5426\u53ef\u4ee5\u5beb\u5165<\/li>
  • -x \u6e2c\u8a66\u6a94\u6848\u662f\u5426\u53ef\u4ee5\u57f7\u884c<\/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

    \u8907\u5408\u5f0f\u6307\u4ee4 (\u6578\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

    if [[ $VAL -lt $VAL2 ]]
    then
    \u00a0\u00a0\u00a0 echo “value is smaller”
    fi<\/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
    • -eq \u6e2c\u8a66\u5169\u6578\u5b57\u662f\u5426\u76f8\u7b49<\/li>
    • -gt \u6e2c\u8a66\u6578\u5b57\u662f\u5426\u8f03\u5927<\/li>
    • -lt \u6e2c\u8a66\u6578\u5b57\u662f\u5426\u8f03\u5c0f<\/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

      \u9700\u8981\u6ce8\u610f\u00a0 > \u5b57\u5143 \u548c\u00a0 < \u5b57\u5143\u4e0d\u592a\u4e00\u6a23
      \u9019\u908a\u7684\u904b\u7b97\u5b50\u662f\u63a1\u53d6\u8a5e\u8a9e\u5f0f\u7684\u908f\u8f2f\u6bd4\u8f03\uff0c\u6240\u4ee5\u6703\u6839\u64da\u5b57\u6bcd\u8a0a\u7e8c\u6392\u5e8f\u4f86\u6bd4\u8f03
      eg: 1<2 , 12<2<\/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

      \u96d9\u5c0f\u62ec\u5f27<\/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\u8981\u7528\u904b\u7b97\u5b50\u4f86\u9032\u884c\u6bd4\u8f03\uff0c \u53ef\u4ee5\u900f\u904e\u96d9\u5c0f\u62ec\u5f27\uff0c\u4ed6\u6703\u5047\u8a2d\u6240\u6709\u8b8a\u6578\u5167\u5bb9\u90fd\u6578\u503c<\/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

      if (( VAL < 6))
      then
      \u00a0\u00a0\u00a0 echo “smaller than 6”
      fi<\/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

      \u96d9\u5c0f\u62ec\u5f27\u4e2d\uff0c \u90fd\u662f\u63a1\u7528 \u6578\u503c\u5316\u7684\u908f\u8f2f\u6bd4\u8f03\uff0c\u6240\u6709\u975e0 \u90fd\u70ba\u771f\uff0c0 \u70ba \u5047\uff0c \u82e5\u900f\u904e $? \u53d6\u5f97\u57f7\u884c\u72c0\u614b\uff0c \u524d\u9762\u6307\u4ee4\u5931\u6557\uff0c\u56de\u50b3 \u975e0 \uff0c\u4f46\u5728\u6578\u503c\u5316\u7684\u908f\u8f2f\u6bd4\u8f03\uff0c\u975e0 \u70ba\u771f\uff0c\u6545\u6700\u5f8c\u5c31\u6703\u8b8a\u6210\u70ba\u771f<\/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

      \u6c7a\u7b56<\/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

      \u5728BASH \u4e5f\u4e0d\u4e00\u5b9a\u9700\u8981\u900f\u904e if\/then \u4f86\u5f62\u6210\u6c7a\u7b56\u5206\u652f<\/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

      \u6307\u4ee4A && \u6307\u4ee4B<\/p>

      • \u6307\u4ee4A \u6210\u529f \u624d\u6703\u57f7\u884c \u6307\u4ee4B<\/li><\/ul>

        \u6307\u4ee4A || \u6307\u4ee4B<\/p>

        • \u6307\u4ee4A \u5931\u6557 \u624d\u6703\u57f7\u884c \u6307\u4ee4B<\/li><\/ul>

          \u4e0b\u5217\u5169\u8005\u7a0b\u5f0f\u78bc\u70ba\u76f8\u540c\u529f\u80fd<\/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
          • [[ -d $DIR ]] && “$DIR”<\/li>
          • if [[ -d $DIR]] ; then; ls “$DIR” ;fi;<\/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

            PS:\u82e5\u6307\u4ee4A\u3001B \u70ba\u591a\u500b\u6307\u4ee4\uff0c\u53ef\u4ee5\u900f\u904e{} \u4f86\u4e00\u4f75<\/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":"

            bash \u662f\u4e00\u500b\u547d\u4ee4\u8655\u7406\u5668\uff0c\u901a\u5e38\u57f7\u884c\u5728CLI\u4ecb\u9762\u3002\u901a\u5e38\u6211\u5011\u90fd\u6703\u90fd\u6703BASH \u4f86\u64b0\u5beb\u6307\u4ee4\u78bc\uff0c\u5728\u5f88\u591a\u6642\u5019\u6703\u975e\u5e38\u65b9\u4fbf\u3002 \u8f38\u51fa \u8f38\u51fa\u90e8\u5206\u8ddf\u5f88\u591a\u7a0b\u5f0f\u4e00\u6a23\u3002\u53ef\u4ee5\u900f\u904e”echo”\u548c”printf”\u4f86\u8f38\u51fa\u6a94\u6848\u3002 echo $ echo “Hello World” \u00a0 Hello World echo \u6703\u5728\u5b57\u4e32\u5f8c\u9762\u52a0\u4e0a\u63db\u884c\u5b57\u7b26 prinrf $ printf “Hello Worldn” \u8b8a\u6578 \u8b8a\u6578\u90e8\u5206\u4e5f\u662f\u8ddf\u7a0b\u5f0f\u5beb\u6cd5\u4e00\u6a23\uff0c\u4e0d\u904e\u9700\u8981\u6ce8\u610f\u7684\u662f\u9700\u53c8\u900f\u904e”$”\u5b57\u5143\u624d\u80fd\u5920\u5c07\u8b8a\u6578\u88e1\u9762\u7684\u503c\u53d6\u51fa\u3002\u53e6\u5916\u4e5f\u9700\u8981\u6ce8\u610f\u8b8a\u6578\u88e1\u9762\u7684\u578b\u614b\u3002 \u8ce6\u503c Greetings=Hello \u00a0 \u53d6\u503c \u900f\u904e $\u5b57\u5143 \u5c07\u8b8a\u6578\u7684\u503c\u53d6\u51fa\u4f86 echo $Greetings \u55ae\u5f15\u865f & \u96d9\u5f15\u865f \u82e5\u6709\u591a\u500b\u7684\u55ae\u5b57\uff0c\u9700\u8981\u7528\u55ae\u5f15\u865f\u5305\u8d77\u4f86 Greeting=’only for words’ \u82e5\u9700\u8981\u4f7f\u7528\u8b8a\u6578\u529f\u80fd\uff0c\u5247\u9700\u8981\u7528\u96d9\u5f15\u865f\u5305\u8d77\u4f86 Greeting2= “if want to use variable” \u7528\u96d9\u5f15\u865f(“)\uff0c\u4efb\u4f55$\u5b57\u5143\u958b\u982d\u7684\u90e8\u5206\u90fd\u6703\u88ab\u66ff\u63db \u4f4d\u7f6e\u53c3\u6578 \u82e5\u8981\u53d6\u7684\u53d6\u5f97\u7684\u53c3\u6578\uff0c\u53ef\u4ee5\u900f\u904e $\u5b57\u5143 +\u6578\u5b57\u4f86\u53d6\u5f97\u53c3\u6578$0 \u5247\u6703\u53d6\u5f97\u6307\u4ee4\u641e\u7684\u540d\u7a31$# \u5247\u6703\u53d6\u5f97\u8a72\u6307\u4ee4\u641e\u5728\u57f7\u884c\u6642\uff0c\u8f38\u5165\u7684\u53c3\u6578\u6578\u91cf\u7bc4\u4f8b\u6307\u4ee4\u641e\u5982\u4e0b\u6240\u793a #!\/bin\/bash –# test02.sh echo $1echo $2echo $3 echo $0echo $# \u53ef\u4ee5\u900f\u904e$ \u4f86\u5206\u5225\u53d6\u5f97\u53c3\u6578\u3001\u6307\u4ee4\u641e\u540d\u7a31\u3001\u53c3\u6578\u6578\u91cf $ .\/test02.sh\u00a0 hello world ?? \u00a0\u00a0 helloworld??.\/test02.sh3 \u8f38\u51fa bash \u900f\u904e read \u8b80\u53d6\u8f38\u5165\uff0c\u4ed6\u6703\u5f9e stdin \u4f86\u63a5\u6536\u4f7f\u7528\u8005\u7684\u8f38\u5165\uff0c\u518d\u5b58\u5728\u6307\u5b9a\u7684\u8b8a\u6578\u88e1\u9762 read data \u4e5f\u53ef\u4ee5\u900f\u904e read \u4f86\u9054\u5230\u7a0b\u5f0f\u66ab\u505c\u7684\u529f\u80fd # \u689d\u4ef6\u5224\u65b7 \u4efb\u4f55\u5728 bash \u4e2d\u5f15\u7528\u7684\u6307\u4ee4\u6216\u662f\u7a0b\u5f0f\uff0c\u53ef\u80fd\u90fd\u6703\u7522\u751f\u8f38\u51fa\uff0c\u4f46\u4e5f\u6703\u50b3\u56de\u4e00\u500b\u4ee3\u8868\u6210\u529f\u6216\u662f\u5931\u6557\u7684\u503c\u3002\u00a0\u5728 shell \u4e2d\uff0c\u53ea\u8981\u662f\u525b\u525b\u57f7\u884c\u7684\u6307\u4ee4(\u9084\u672a\u57f7\u884c\u4e0b\u4e00\u500b\u6307\u4ee4\u524d)\uff0c\u90fd\u53ef\u4ee5\u900f\u904e $? \u8b8a\u6578\u53d6\u5f97\u72c0\u614b\u3002\u00a00 \u4ee3\u8868\u6210\u529f\u3001\u70ba\u771f \uff0c\u4efb\u4f55\u975e 0 \u503c\u4ee3\u8868\u5931\u6557\u3001\u70ba\u5047 if conditionthen \u00a0\u00a0\u00a0 actionselif condition2then \u00a0\u00a0\u00a0 actions2else\u00a0\u00a0\u00a0 otherfi \u6307\u4ee4 + \u689d\u4ef6 if cd \/testthen \u00a0\u00a0\u00a0 echo “the thing in \/test”\u00a0\u00a0\u00a0 ls -lfi \u7ba1\u7dda\u4e32\u6d41 if ls | gerp pdfthen \u00a0\u00a0\u00a0 echo “have pdf”else\u00a0\u00a0\u00a0 echo “no pdf”fi \u4f46\u9700\u8981\u6ce8\u610f\uff0c\u82e5\u4f7f\u7528\u7ba1\u7dda\uff0c\u5247\u6703\u4ee5\u6700\u5f8c\u4e00\u689d\u6307\u4ee4\u7684\u6210\u529f\u8207\u5426\u4f86\u5224\u65b7\u3002\u4e0b\u5217\u7bc4\u4f8b\u4e0d\u7ba1\u6709\u6c92\u6709\u627e\u5230 pdf \uff0c\u90fd\u6703\u8f38\u51fa “have pdf” #!\/bin\/bash – if ls | grep pdf | echo ‘1’then\u00a0\u00a0\u00a0 echo “have pdf”else \u00a0\u00a0\u00a0 echo “no pdf” fi \u8907\u5408\u5f0f\u6307\u4ee4 (\u6a94\u6848) if [[ -e $FILENAME]]then    echo $FILENAME existsfi -d \u6e2c\u8a66\u76ee\u9304\u662f\u5426\u5b58\u5728 -e \u6e2c\u8a66\u6a94\u6848\u662f\u5426\u5b58\u8f09 -r \u6e2c\u8a66\u6a94\u6848\u662f\u5426\u53ef\u4ee5\u8b80\u53d6 -w \u6e2c\u8a66\u6a94\u6848\u662f\u5426\u53ef\u4ee5\u5beb\u5165 -x \u6e2c\u8a66\u6a94\u6848\u662f\u5426\u53ef\u4ee5\u57f7\u884c \u8907\u5408\u5f0f\u6307\u4ee4 (\u6578\u503c) if [[ $VAL -lt $VAL2 ]]then \u00a0\u00a0\u00a0 echo “value is smaller”fi -eq \u6e2c\u8a66\u5169\u6578\u5b57\u662f\u5426\u76f8\u7b49 -gt \u6e2c\u8a66\u6578\u5b57\u662f\u5426\u8f03\u5927 -lt \u6e2c\u8a66\u6578\u5b57\u662f\u5426\u8f03\u5c0f \u9700\u8981\u6ce8\u610f\u00a0 > \u5b57\u5143 \u548c\u00a0 < \u5b57\u5143\u4e0d\u592a\u4e00\u6a23\u9019\u908a\u7684\u904b\u7b97\u5b50\u662f\u63a1\u53d6\u8a5e\u8a9e\u5f0f\u7684\u908f\u8f2f\u6bd4\u8f03\uff0c\u6240\u4ee5\u6703\u6839\u64da\u5b57\u6bcd\u8a0a\u7e8c\u6392\u5e8f\u4f86\u6bd4\u8f03eg: 1<2 , 12<2 \u96d9\u5c0f\u62ec\u5f27 \u5982\u679c\u8981\u7528\u904b\u7b97\u5b50\u4f86\u9032\u884c\u6bd4\u8f03\uff0c \u53ef\u4ee5\u900f\u904e\u96d9\u5c0f\u62ec\u5f27\uff0c\u4ed6\u6703\u5047\u8a2d\u6240\u6709\u8b8a\u6578\u5167\u5bb9\u90fd\u6578\u503c if (( VAL < 6))then\u00a0\u00a0\u00a0 echo “smaller than 6”fi \u96d9\u5c0f\u62ec\u5f27\u4e2d\uff0c \u90fd\u662f\u63a1\u7528 \u6578\u503c\u5316\u7684\u908f\u8f2f\u6bd4\u8f03\uff0c\u6240\u6709\u975e0 \u90fd\u70ba\u771f\uff0c0 \u70ba \u5047\uff0c \u82e5\u900f\u904e $? \u53d6\u5f97\u57f7\u884c\u72c0\u614b\uff0c \u524d\u9762\u6307\u4ee4\u5931\u6557\uff0c\u56de\u50b3 \u975e0 \uff0c\u4f46\u5728\u6578\u503c\u5316\u7684\u908f\u8f2f\u6bd4\u8f03\uff0c\u975e0 \u70ba\u771f\uff0c\u6545\u6700\u5f8c\u5c31\u6703\u8b8a\u6210\u70ba\u771f \u6c7a\u7b56 \u5728BASH \u4e5f\u4e0d\u4e00\u5b9a\u9700\u8981\u900f\u904e if\/th…<\/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-185","post","type-post","status-publish","format-standard","hentry","category-bash","category-research-study"],"yoast_head":"\nbash - \u57fa\u672c\u6587\u6cd5\u6559\u5b78 #1 - 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=185\" \/>\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 #1 - Ares Vlog\" \/>\n<meta property=\"og:description\" content=\"bash \u662f\u4e00\u500b\u547d\u4ee4\u8655\u7406\u5668\uff0c\u901a\u5e38\u57f7\u884c\u5728CLI\u4ecb\u9762\u3002\u901a\u5e38\u6211\u5011\u90fd\u6703\u90fd\u6703BASH \u4f86\u64b0\u5beb\u6307\u4ee4\u78bc\uff0c\u5728\u5f88\u591a\u6642\u5019\u6703\u975e\u5e38\u65b9\u4fbf\u3002 \u8f38\u51fa \u8f38\u51fa\u90e8\u5206\u8ddf\u5f88\u591a\u7a0b\u5f0f\u4e00\u6a23\u3002\u53ef\u4ee5\u900f\u904e”echo”\u548c”printf”\u4f86\u8f38\u51fa\u6a94\u6848\u3002 echo $ echo “Hello World” \u00a0 Hello World echo \u6703\u5728\u5b57\u4e32\u5f8c\u9762\u52a0\u4e0a\u63db\u884c\u5b57\u7b26 prinrf $ printf “Hello Worldn” \u8b8a\u6578 \u8b8a\u6578\u90e8\u5206\u4e5f\u662f\u8ddf\u7a0b\u5f0f\u5beb\u6cd5\u4e00\u6a23\uff0c\u4e0d\u904e\u9700\u8981\u6ce8\u610f\u7684\u662f\u9700\u53c8\u900f\u904e”$”\u5b57\u5143\u624d\u80fd\u5920\u5c07\u8b8a\u6578\u88e1\u9762\u7684\u503c\u53d6\u51fa\u3002\u53e6\u5916\u4e5f\u9700\u8981\u6ce8\u610f\u8b8a\u6578\u88e1\u9762\u7684\u578b\u614b\u3002 \u8ce6\u503c Greetings=Hello \u00a0 \u53d6\u503c \u900f\u904e $\u5b57\u5143 \u5c07\u8b8a\u6578\u7684\u503c\u53d6\u51fa\u4f86 echo $Greetings \u55ae\u5f15\u865f & \u96d9\u5f15\u865f \u82e5\u6709\u591a\u500b\u7684\u55ae\u5b57\uff0c\u9700\u8981\u7528\u55ae\u5f15\u865f\u5305\u8d77\u4f86 Greeting=’only for words’ \u82e5\u9700\u8981\u4f7f\u7528\u8b8a\u6578\u529f\u80fd\uff0c\u5247\u9700\u8981\u7528\u96d9\u5f15\u865f\u5305\u8d77\u4f86 Greeting2= “if want to use variable” \u7528\u96d9\u5f15\u865f(“)\uff0c\u4efb\u4f55$\u5b57\u5143\u958b\u982d\u7684\u90e8\u5206\u90fd\u6703\u88ab\u66ff\u63db \u4f4d\u7f6e\u53c3\u6578 \u82e5\u8981\u53d6\u7684\u53d6\u5f97\u7684\u53c3\u6578\uff0c\u53ef\u4ee5\u900f\u904e $\u5b57\u5143 +\u6578\u5b57\u4f86\u53d6\u5f97\u53c3\u6578$0 \u5247\u6703\u53d6\u5f97\u6307\u4ee4\u641e\u7684\u540d\u7a31$# \u5247\u6703\u53d6\u5f97\u8a72\u6307\u4ee4\u641e\u5728\u57f7\u884c\u6642\uff0c\u8f38\u5165\u7684\u53c3\u6578\u6578\u91cf\u7bc4\u4f8b\u6307\u4ee4\u641e\u5982\u4e0b\u6240\u793a #!\/bin\/bash –# test02.sh echo $1echo $2echo $3 echo $0echo $# \u53ef\u4ee5\u900f\u904e$ \u4f86\u5206\u5225\u53d6\u5f97\u53c3\u6578\u3001\u6307\u4ee4\u641e\u540d\u7a31\u3001\u53c3\u6578\u6578\u91cf $ .\/test02.sh\u00a0 hello world ?? \u00a0\u00a0 helloworld??.\/test02.sh3 \u8f38\u51fa bash \u900f\u904e read \u8b80\u53d6\u8f38\u5165\uff0c\u4ed6\u6703\u5f9e stdin \u4f86\u63a5\u6536\u4f7f\u7528\u8005\u7684\u8f38\u5165\uff0c\u518d\u5b58\u5728\u6307\u5b9a\u7684\u8b8a\u6578\u88e1\u9762 read data \u4e5f\u53ef\u4ee5\u900f\u904e read \u4f86\u9054\u5230\u7a0b\u5f0f\u66ab\u505c\u7684\u529f\u80fd # \u689d\u4ef6\u5224\u65b7 \u4efb\u4f55\u5728 bash \u4e2d\u5f15\u7528\u7684\u6307\u4ee4\u6216\u662f\u7a0b\u5f0f\uff0c\u53ef\u80fd\u90fd\u6703\u7522\u751f\u8f38\u51fa\uff0c\u4f46\u4e5f\u6703\u50b3\u56de\u4e00\u500b\u4ee3\u8868\u6210\u529f\u6216\u662f\u5931\u6557\u7684\u503c\u3002\u00a0\u5728 shell \u4e2d\uff0c\u53ea\u8981\u662f\u525b\u525b\u57f7\u884c\u7684\u6307\u4ee4(\u9084\u672a\u57f7\u884c\u4e0b\u4e00\u500b\u6307\u4ee4\u524d)\uff0c\u90fd\u53ef\u4ee5\u900f\u904e $? \u8b8a\u6578\u53d6\u5f97\u72c0\u614b\u3002\u00a00 \u4ee3\u8868\u6210\u529f\u3001\u70ba\u771f \uff0c\u4efb\u4f55\u975e 0 \u503c\u4ee3\u8868\u5931\u6557\u3001\u70ba\u5047 if conditionthen \u00a0\u00a0\u00a0 actionselif condition2then \u00a0\u00a0\u00a0 actions2else\u00a0\u00a0\u00a0 otherfi \u6307\u4ee4 + \u689d\u4ef6 if cd \/testthen \u00a0\u00a0\u00a0 echo “the thing in \/test”\u00a0\u00a0\u00a0 ls -lfi \u7ba1\u7dda\u4e32\u6d41 if ls | gerp pdfthen \u00a0\u00a0\u00a0 echo “have pdf”else\u00a0\u00a0\u00a0 echo “no pdf”fi \u4f46\u9700\u8981\u6ce8\u610f\uff0c\u82e5\u4f7f\u7528\u7ba1\u7dda\uff0c\u5247\u6703\u4ee5\u6700\u5f8c\u4e00\u689d\u6307\u4ee4\u7684\u6210\u529f\u8207\u5426\u4f86\u5224\u65b7\u3002\u4e0b\u5217\u7bc4\u4f8b\u4e0d\u7ba1\u6709\u6c92\u6709\u627e\u5230 pdf \uff0c\u90fd\u6703\u8f38\u51fa “have pdf” #!\/bin\/bash – if ls | grep pdf | echo ‘1’then\u00a0\u00a0\u00a0 echo “have pdf”else \u00a0\u00a0\u00a0 echo “no pdf” fi \u8907\u5408\u5f0f\u6307\u4ee4 (\u6a94\u6848) if [[ -e $FILENAME]]then    echo $FILENAME existsfi -d \u6e2c\u8a66\u76ee\u9304\u662f\u5426\u5b58\u5728 -e \u6e2c\u8a66\u6a94\u6848\u662f\u5426\u5b58\u8f09 -r \u6e2c\u8a66\u6a94\u6848\u662f\u5426\u53ef\u4ee5\u8b80\u53d6 -w \u6e2c\u8a66\u6a94\u6848\u662f\u5426\u53ef\u4ee5\u5beb\u5165 -x \u6e2c\u8a66\u6a94\u6848\u662f\u5426\u53ef\u4ee5\u57f7\u884c \u8907\u5408\u5f0f\u6307\u4ee4 (\u6578\u503c) if [[ $VAL -lt $VAL2 ]]then \u00a0\u00a0\u00a0 echo “value is smaller”fi -eq \u6e2c\u8a66\u5169\u6578\u5b57\u662f\u5426\u76f8\u7b49 -gt \u6e2c\u8a66\u6578\u5b57\u662f\u5426\u8f03\u5927 -lt \u6e2c\u8a66\u6578\u5b57\u662f\u5426\u8f03\u5c0f \u9700\u8981\u6ce8\u610f\u00a0 > \u5b57\u5143 \u548c\u00a0 < \u5b57\u5143\u4e0d\u592a\u4e00\u6a23\u9019\u908a\u7684\u904b\u7b97\u5b50\u662f\u63a1\u53d6\u8a5e\u8a9e\u5f0f\u7684\u908f\u8f2f\u6bd4\u8f03\uff0c\u6240\u4ee5\u6703\u6839\u64da\u5b57\u6bcd\u8a0a\u7e8c\u6392\u5e8f\u4f86\u6bd4\u8f03eg: 1<2 , 12<2 \u96d9\u5c0f\u62ec\u5f27 \u5982\u679c\u8981\u7528\u904b\u7b97\u5b50\u4f86\u9032\u884c\u6bd4\u8f03\uff0c \u53ef\u4ee5\u900f\u904e\u96d9\u5c0f\u62ec\u5f27\uff0c\u4ed6\u6703\u5047\u8a2d\u6240\u6709\u8b8a\u6578\u5167\u5bb9\u90fd\u6578\u503c if (( VAL < 6))then\u00a0\u00a0\u00a0 echo “smaller than 6”fi \u96d9\u5c0f\u62ec\u5f27\u4e2d\uff0c \u90fd\u662f\u63a1\u7528 \u6578\u503c\u5316\u7684\u908f\u8f2f\u6bd4\u8f03\uff0c\u6240\u6709\u975e0 \u90fd\u70ba\u771f\uff0c0 \u70ba \u5047\uff0c \u82e5\u900f\u904e $? \u53d6\u5f97\u57f7\u884c\u72c0\u614b\uff0c \u524d\u9762\u6307\u4ee4\u5931\u6557\uff0c\u56de\u50b3 \u975e0 \uff0c\u4f46\u5728\u6578\u503c\u5316\u7684\u908f\u8f2f\u6bd4\u8f03\uff0c\u975e0 \u70ba\u771f\uff0c\u6545\u6700\u5f8c\u5c31\u6703\u8b8a\u6210\u70ba\u771f \u6c7a\u7b56 \u5728BASH \u4e5f\u4e0d\u4e00\u5b9a\u9700\u8981\u900f\u904e if\/th...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.yuyiares.com\/?p=185\" \/>\n<meta property=\"og:site_name\" content=\"Ares Vlog\" \/>\n<meta property=\"article:published_time\" content=\"2021-12-22T08:00:56+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-09-30T05:11:02+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 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\/ Yoast SEO plugin. -->","yoast_head_json":{"title":"bash - \u57fa\u672c\u6587\u6cd5\u6559\u5b78 #1 - 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=185","og_locale":"zh_TW","og_type":"article","og_title":"bash - \u57fa\u672c\u6587\u6cd5\u6559\u5b78 #1 - Ares Vlog","og_description":"bash \u662f\u4e00\u500b\u547d\u4ee4\u8655\u7406\u5668\uff0c\u901a\u5e38\u57f7\u884c\u5728CLI\u4ecb\u9762\u3002\u901a\u5e38\u6211\u5011\u90fd\u6703\u90fd\u6703BASH \u4f86\u64b0\u5beb\u6307\u4ee4\u78bc\uff0c\u5728\u5f88\u591a\u6642\u5019\u6703\u975e\u5e38\u65b9\u4fbf\u3002 \u8f38\u51fa \u8f38\u51fa\u90e8\u5206\u8ddf\u5f88\u591a\u7a0b\u5f0f\u4e00\u6a23\u3002\u53ef\u4ee5\u900f\u904e”echo”\u548c”printf”\u4f86\u8f38\u51fa\u6a94\u6848\u3002 echo $ echo “Hello World” \u00a0 Hello World echo \u6703\u5728\u5b57\u4e32\u5f8c\u9762\u52a0\u4e0a\u63db\u884c\u5b57\u7b26 prinrf $ printf “Hello Worldn” \u8b8a\u6578 \u8b8a\u6578\u90e8\u5206\u4e5f\u662f\u8ddf\u7a0b\u5f0f\u5beb\u6cd5\u4e00\u6a23\uff0c\u4e0d\u904e\u9700\u8981\u6ce8\u610f\u7684\u662f\u9700\u53c8\u900f\u904e”$”\u5b57\u5143\u624d\u80fd\u5920\u5c07\u8b8a\u6578\u88e1\u9762\u7684\u503c\u53d6\u51fa\u3002\u53e6\u5916\u4e5f\u9700\u8981\u6ce8\u610f\u8b8a\u6578\u88e1\u9762\u7684\u578b\u614b\u3002 \u8ce6\u503c Greetings=Hello \u00a0 \u53d6\u503c \u900f\u904e $\u5b57\u5143 \u5c07\u8b8a\u6578\u7684\u503c\u53d6\u51fa\u4f86 echo $Greetings \u55ae\u5f15\u865f & \u96d9\u5f15\u865f \u82e5\u6709\u591a\u500b\u7684\u55ae\u5b57\uff0c\u9700\u8981\u7528\u55ae\u5f15\u865f\u5305\u8d77\u4f86 Greeting=’only for words’ \u82e5\u9700\u8981\u4f7f\u7528\u8b8a\u6578\u529f\u80fd\uff0c\u5247\u9700\u8981\u7528\u96d9\u5f15\u865f\u5305\u8d77\u4f86 Greeting2= “if want to use variable” \u7528\u96d9\u5f15\u865f(“)\uff0c\u4efb\u4f55$\u5b57\u5143\u958b\u982d\u7684\u90e8\u5206\u90fd\u6703\u88ab\u66ff\u63db \u4f4d\u7f6e\u53c3\u6578 \u82e5\u8981\u53d6\u7684\u53d6\u5f97\u7684\u53c3\u6578\uff0c\u53ef\u4ee5\u900f\u904e $\u5b57\u5143 +\u6578\u5b57\u4f86\u53d6\u5f97\u53c3\u6578$0 \u5247\u6703\u53d6\u5f97\u6307\u4ee4\u641e\u7684\u540d\u7a31$# \u5247\u6703\u53d6\u5f97\u8a72\u6307\u4ee4\u641e\u5728\u57f7\u884c\u6642\uff0c\u8f38\u5165\u7684\u53c3\u6578\u6578\u91cf\u7bc4\u4f8b\u6307\u4ee4\u641e\u5982\u4e0b\u6240\u793a #!\/bin\/bash –# test02.sh echo $1echo $2echo $3 echo $0echo $# \u53ef\u4ee5\u900f\u904e$ \u4f86\u5206\u5225\u53d6\u5f97\u53c3\u6578\u3001\u6307\u4ee4\u641e\u540d\u7a31\u3001\u53c3\u6578\u6578\u91cf $ .\/test02.sh\u00a0 hello world ?? \u00a0\u00a0 helloworld??.\/test02.sh3 \u8f38\u51fa bash \u900f\u904e read \u8b80\u53d6\u8f38\u5165\uff0c\u4ed6\u6703\u5f9e stdin \u4f86\u63a5\u6536\u4f7f\u7528\u8005\u7684\u8f38\u5165\uff0c\u518d\u5b58\u5728\u6307\u5b9a\u7684\u8b8a\u6578\u88e1\u9762 read data \u4e5f\u53ef\u4ee5\u900f\u904e read \u4f86\u9054\u5230\u7a0b\u5f0f\u66ab\u505c\u7684\u529f\u80fd # \u689d\u4ef6\u5224\u65b7 \u4efb\u4f55\u5728 bash \u4e2d\u5f15\u7528\u7684\u6307\u4ee4\u6216\u662f\u7a0b\u5f0f\uff0c\u53ef\u80fd\u90fd\u6703\u7522\u751f\u8f38\u51fa\uff0c\u4f46\u4e5f\u6703\u50b3\u56de\u4e00\u500b\u4ee3\u8868\u6210\u529f\u6216\u662f\u5931\u6557\u7684\u503c\u3002\u00a0\u5728 shell \u4e2d\uff0c\u53ea\u8981\u662f\u525b\u525b\u57f7\u884c\u7684\u6307\u4ee4(\u9084\u672a\u57f7\u884c\u4e0b\u4e00\u500b\u6307\u4ee4\u524d)\uff0c\u90fd\u53ef\u4ee5\u900f\u904e $? \u8b8a\u6578\u53d6\u5f97\u72c0\u614b\u3002\u00a00 \u4ee3\u8868\u6210\u529f\u3001\u70ba\u771f \uff0c\u4efb\u4f55\u975e 0 \u503c\u4ee3\u8868\u5931\u6557\u3001\u70ba\u5047 if conditionthen \u00a0\u00a0\u00a0 actionselif condition2then \u00a0\u00a0\u00a0 actions2else\u00a0\u00a0\u00a0 otherfi \u6307\u4ee4 + \u689d\u4ef6 if cd \/testthen \u00a0\u00a0\u00a0 echo “the thing in \/test”\u00a0\u00a0\u00a0 ls -lfi \u7ba1\u7dda\u4e32\u6d41 if ls | gerp pdfthen \u00a0\u00a0\u00a0 echo “have pdf”else\u00a0\u00a0\u00a0 echo “no pdf”fi \u4f46\u9700\u8981\u6ce8\u610f\uff0c\u82e5\u4f7f\u7528\u7ba1\u7dda\uff0c\u5247\u6703\u4ee5\u6700\u5f8c\u4e00\u689d\u6307\u4ee4\u7684\u6210\u529f\u8207\u5426\u4f86\u5224\u65b7\u3002\u4e0b\u5217\u7bc4\u4f8b\u4e0d\u7ba1\u6709\u6c92\u6709\u627e\u5230 pdf \uff0c\u90fd\u6703\u8f38\u51fa “have pdf” #!\/bin\/bash – if ls | grep pdf | echo ‘1’then\u00a0\u00a0\u00a0 echo “have pdf”else \u00a0\u00a0\u00a0 echo “no pdf” fi \u8907\u5408\u5f0f\u6307\u4ee4 (\u6a94\u6848) if [[ -e $FILENAME]]then    echo $FILENAME existsfi -d \u6e2c\u8a66\u76ee\u9304\u662f\u5426\u5b58\u5728 -e \u6e2c\u8a66\u6a94\u6848\u662f\u5426\u5b58\u8f09 -r \u6e2c\u8a66\u6a94\u6848\u662f\u5426\u53ef\u4ee5\u8b80\u53d6 -w \u6e2c\u8a66\u6a94\u6848\u662f\u5426\u53ef\u4ee5\u5beb\u5165 -x \u6e2c\u8a66\u6a94\u6848\u662f\u5426\u53ef\u4ee5\u57f7\u884c \u8907\u5408\u5f0f\u6307\u4ee4 (\u6578\u503c) if [[ $VAL -lt $VAL2 ]]then \u00a0\u00a0\u00a0 echo “value is smaller”fi -eq \u6e2c\u8a66\u5169\u6578\u5b57\u662f\u5426\u76f8\u7b49 -gt \u6e2c\u8a66\u6578\u5b57\u662f\u5426\u8f03\u5927 -lt \u6e2c\u8a66\u6578\u5b57\u662f\u5426\u8f03\u5c0f \u9700\u8981\u6ce8\u610f\u00a0 > \u5b57\u5143 \u548c\u00a0 < \u5b57\u5143\u4e0d\u592a\u4e00\u6a23\u9019\u908a\u7684\u904b\u7b97\u5b50\u662f\u63a1\u53d6\u8a5e\u8a9e\u5f0f\u7684\u908f\u8f2f\u6bd4\u8f03\uff0c\u6240\u4ee5\u6703\u6839\u64da\u5b57\u6bcd\u8a0a\u7e8c\u6392\u5e8f\u4f86\u6bd4\u8f03eg: 1<2 , 12<2 \u96d9\u5c0f\u62ec\u5f27 \u5982\u679c\u8981\u7528\u904b\u7b97\u5b50\u4f86\u9032\u884c\u6bd4\u8f03\uff0c \u53ef\u4ee5\u900f\u904e\u96d9\u5c0f\u62ec\u5f27\uff0c\u4ed6\u6703\u5047\u8a2d\u6240\u6709\u8b8a\u6578\u5167\u5bb9\u90fd\u6578\u503c if (( VAL < 6))then\u00a0\u00a0\u00a0 echo “smaller than 6”fi \u96d9\u5c0f\u62ec\u5f27\u4e2d\uff0c \u90fd\u662f\u63a1\u7528 \u6578\u503c\u5316\u7684\u908f\u8f2f\u6bd4\u8f03\uff0c\u6240\u6709\u975e0 \u90fd\u70ba\u771f\uff0c0 \u70ba \u5047\uff0c \u82e5\u900f\u904e $? \u53d6\u5f97\u57f7\u884c\u72c0\u614b\uff0c \u524d\u9762\u6307\u4ee4\u5931\u6557\uff0c\u56de\u50b3 \u975e0 \uff0c\u4f46\u5728\u6578\u503c\u5316\u7684\u908f\u8f2f\u6bd4\u8f03\uff0c\u975e0 \u70ba\u771f\uff0c\u6545\u6700\u5f8c\u5c31\u6703\u8b8a\u6210\u70ba\u771f \u6c7a\u7b56 \u5728BASH \u4e5f\u4e0d\u4e00\u5b9a\u9700\u8981\u900f\u904e if\/th...","og_url":"https:\/\/www.yuyiares.com\/?p=185","og_site_name":"Ares Vlog","article_published_time":"2021-12-22T08:00:56+00:00","article_modified_time":"2022-09-30T05:11:02+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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