{"id":299,"date":"2021-07-04T20:39:00","date_gmt":"2021-07-04T12:39:00","guid":{"rendered":"https:\/\/www.buyao007.icu\/?p=299"},"modified":"2021-07-04T20:44:07","modified_gmt":"2021-07-04T12:44:07","slug":"1-shell%e7%bc%96%e7%a8%8b%e4%b9%8b%e5%8f%98%e9%87%8f","status":"publish","type":"post","link":"https:\/\/www.buyao007.icu\/?p=299","title":{"rendered":"1.shell\u7f16\u7a0b\u4e4b\u53d8\u91cf"},"content":{"rendered":"\n

\u5b59\u5bcc\u9633\uff0c \u6c5f\u6e56\u4eba\u79f0\u6ca1\u4eba\u79f0\u3002\u591a\u5e74\u4e92\u8054\u7f51\u8fd0\u7ef4\u5de5\u4f5c\u7ecf\u9a8c\uff0c\u66fe\u8d1f\u8d23\u8fc7\u5b59\u5e03\u65af\u5927\u89c4\u6a21\u96c6\u7fa4\u67b6\u6784\u81ea\u52a8\u5316\u8fd0\u7ef4\u7ba1\u7406\u5de5\u4f5c\u3002\u64c5\u957fWeb\u96c6\u7fa4\u67b6\u6784\u4e0e\u81ea\u52a8\u5316\u8fd0\u7ef4\uff0c\u66fe\u8d1f\u8d23\u56fd\u5185\u67d0\u5927\u578b\u535a\u5ba2\u7f51\u7ad9\u8fd0\u7ef4\u5de5\u4f5c\u3002<\/p>\n\n\n\n

1.shell\u811a\u672c\u7684\u6292\u5199\u65b9\u5f0f<\/h2>\n\n\n\n

1.1shell\u811a\u672c\u540d\uff1a<\/strong>
\u540d\u5b57\u8981\u6709\u610f\u4e49\uff0c\u4e0d\u8981\u4f7f\u7528a\u3001b\u3001c\u30011\u30012\u30013\u3001\u8fd9\u79cd\u65b9\u5f0f\u547d\u540d\uff1b\u867d\u7136Linux\u7cfb\u7edf\u4e2d\uff0c\u6587\u4ef6\u6ca1\u6709\u6269\u5c55\u540d\u7684\u6982\u5ff5\uff0c\u4f9d\u7136\u5efa\u8bae\u4f7f\u7528.sh\u7ed3\u5c3e\uff1b\u540d\u5b57\u4e0d\u8981\u592a\u957f\uff0c\u6700\u597d\u80fd\u572830\u4e2a\u5b57\u8282\u4ee5\u5185\u89e3\u51b3\u3002\u4f8b\u5982\uff1acheck_memorooy.sh<\/p>\n\n\n\n

1.2shell\u811a\u672c\u683c\u5f0f:<\/strong>
Shell\u811a\u672c\u5f00\u5934\u5fc5\u987b\u6307\u5b9a\u811a\u672c\u8fd0\u884c\u73af\u5883\uff0c\u4ee5#\uff01\u8fd9\u4e2a\u7279\u6b8a\u7b26\u53f7\u7ec4\u5408\u6765\u7ec4\u6210\u3002\u5982\uff1a#!\/bin\/bash\u6307\u5b9a\u8be5\u811a\u672c\u662f\u8fd0\u884c\u89e3\u6790\u6709\/bin\/bash\u6765\u5b8c\u6210\u7684\uff1b<\/p>\n\n\n\n

1.3shell\u811a\u672c\u4e2d\u7684#\u4f7f\u7528\uff1a<\/strong>
#!\/bin\/bash
#Author:sunfuyang
#Created Time: 2021-11-30
#Script Destcription: first shell script<\/p>\n\n\n\n

2.shell\u811a\u672c\u6267\u884c\u65b9\u5f0f<\/h2>\n\n\n\n

1 \u811a\u672c\u8fd0\u884c\u9700\u8981\u6267\u884c\u6743\u9650\uff0c\u5f53\u6211\u4eec\u7ed9\u4e00\u4e2a\u6587\u4ef6\u8d4b\u4e88\u6267\u884c\u6743\u9650\u540e\uff0c\u8be5\u52a0\u73ed\u5c31\u53ef\u4ee5\u8fd0\u884c\u3002
chmod u+x filename
.\/filename
2.\u5982\u679c\u4e0d\u5e0c\u671b\u8d4b\u4e88\u811a\u672c\u6267\u884c\u6743\u9650\uff0c\u90a3\u4e48\u53ef\u4ee5\u4f7f\u7528bash\u547d\u4ee4\u6765\u8fd0\u884c
bash filename
3. \u4f7f\u7528\u7236shell\u6267\u884c \u5c06\u6587\u4ef6\u4e2d\u7684\u5185\u5bb9\u62ff\u5230\u7236shell\u4e2d\u6267\u884c \u767b\u9646\u7684xshell\u7b2c\u4e00\u6b21\u7a97\u53e3\u79f0\u4e3a\u7236shell
source filename<\/p>\n\n\n\n

3.shell\u53d8\u91cf\u5b9a\u4e49<\/h2>\n\n\n\n

1.\u53d8\u91cf\u5b9a\u4e49\u65b9\u5f0f<\/strong><\/h3>\n\n\n\n

1\u7528\u6237\u81ea\u5b9a\u4e49\u53d8\u91cf\uff1a\u4eba\u4e3a\u5b9a\u4e49\u53d8\u91cf\u540d\u4e0e\u53d8\u91cf\u7684\u503c\u3002
2\u7cfb\u7edf\u73af\u5883\u53d8\u91cf\uff1a\u4fdd\u5b58\u7684\u662f\u548c\u64cd\u4f5c\u7cfb\u7edf\u64cd\u4f5c\u73af\u5883\u76f8\u5173\u7684\u6570\u636e\uff0c\u6240\u6709\u7528\u6237\u90fd\u53ef\u4ee5\u4f7f\u7528\u3002
3\u4f4d\u7f6e\u53c2\u6570\u53d8\u91cf\uff1a\u5411\u811a\u672c\u4e2d\u8fdb\u884c\u4f20\u53c2\uff0c\u53d8\u91cf\u540d\u4e0d\u80fd\u81ea\u5b9a\u4e49\uff0c\u53d8\u91cf\u4f5c\u7528\u662f\u56fa\u5b9a\u7684\u3002
4\u9884\u5b9a\u4e49\u7684\u53d8\u91cf\uff1a\u662fbash\u4e2d\u5df2\u7ecf\u5b9a\u4e49\u597d\u7684\u53d8\u91cf\uff0c\u53d8\u91cf\u540d\u4e0d\u5462\u81ea\u5b9a\u4e49\uff0c\u53d8\u91cf\u7684\u4f5c\u7528\u4e5f\u662f\u56fa\u5b9a\u7684\u3002
1.1\u7528\u6237\u81ea\u5b9a\u4e49\u53d8\u91cf\uff0c\u53d8\u91cf\u540d=\u53d8\u91cf\u503c\u3002\u4e0d\u80fd\u51fa\u73b0\u2018-\u6a2a\u6760\u2019\u547d\u540d<\/strong>
[root@test ~]# a=\"hellow word\"
[root@test ~]# echo $a
hellow word
1.2shell\u6838\u5fc3\u4f4d\u7f6e\u73af\u5883\u53d8\u91cf<\/strong>
1) $0\u8868\u793a\u811a\u672c\u7684\u540d\u79f0 \u5168\u8def\u5f84\u6267\u884c \u663e\u793a\u5168\u8def\u5f84\u7684\u811a\u672c\u540d\u79f0
2) $n\u8868\u793a\u811a\u672c\u7684\u7b2cn\u4e2a\u53c2\u6570 n\u4e3a\u6570\u5b57 0\u5df2\u7ecf\u88ab\u811a\u672c\u540d\u79f0\u5360\u7528 \u4ece1\u5f00\u59cb \u4ece$9\u540e \u9700\u8981\u52a0\u82b1\u62ec\u53f7\u5f15\u8d77\u6765\u4f5c\u4e3a\u4e00\u4e2a\u6574\u4f53${10}
3) $#\u8868\u793a\u4f20\u53c2\u7684\u4e2a\u6570 \u63a7\u5236\u4f20\u53c2\u7684\u4e2a\u6570
4) $*\u8868\u793a\u4f20\u53c2\u7684\u6240\u6709\u53c2\u6570 \u4e0d\u52a0\u53cc\u5f15\u53f7\u548c$@\u76f8\u540c \u52a0\u4e0a\u53cc\u5f15\u53f7 \u8868\u793a\u4e3a\u4e00\u4e2a\u53c2\u6570 \u5728\u811a\u672c\u4e2d\u76f8\u540c \u5faa\u73af\u4f53\u4e0d\u540c
5) $@ \u8868\u793a\u4f20\u53c2\u7684\u6240\u6709\u53c2\u6570 \u4e0d\u52a0\u53cc\u5f15\u53f7\u548c$*\u76f8\u540c \u52a0\u4e0a\u53cc\u5f15\u53f7 \u8868\u793a\u4e3a\u6b63\u5e38\u7684\u4f20\u53c2
6) $? \u8868\u793a\u4e0a\u4e00\u6761\u547d\u4ee4\u6267\u884c\u7684\u7ed3\u679c 0\u4e3a\u6210\u529f \u975e0\u5931\u8d25 \u8fd4\u56de\u503c0-255 \u53ef\u4ee5\u81ea\u5b9a\u4e49\u8fd4\u56de\u503c
7) $$ \u8868\u793a\u811a\u672c\u7684PID
8) $! \u8868\u793a\u4e0a\u4e00\u4e2a\u5728\u540e\u53f0\u8fd0\u884c\u7684\u811a\u672c\u7684PID
9) $_ \u8868\u793a\u83b7\u53d6\u811a\u672c\u7684\u6700\u540e\u4e00\u4e2a\u53c2\u6570 \u7c7b\u4f3cesc .<\/p>\n\n\n\n

2.\u6309\u7167\u751f\u547d\u5468\u671f\u5212\u5206\u73af\u5883\u53d8\u91cf<\/strong><\/h3>\n\n\n\n

1.\u6c38\u4e45\u7684<\/strong>
\u9700\u8981\u5199\u5165\/etc\/profile \u4f7f\u7528\u8fdc\u7a0b\u8fde\u63a5\u5de5\u5177\u8fde\u63a5\u81ea\u52a8\u52a0\u8f7d\/etc\/profile \u6216\u8005\u4f7f\u7528source \u6216. \u91cd\u65b0\u5728\u7236shell\u4e2d\u6267\u884c
2.\u4e34\u65f6\u7684<\/strong>
\u4f7f\u7528export \u58f0\u660e\u5373\u53ef
\u4e0d\u52a0export \u53ea\u5bf9\u5f53\u524d\u7684shell\u751f\u6548
\u52a0export\u5bf9\u5f53\u524d\u6253\u5f00\u7a97\u53e3\u7684\u6240\u6709shell\u751f\u6548
\u67e5\u770b\u73af\u5883\u53d8\u91cf
echo $\u53d8\u91cf\u540d\u79f0
unset $\u53d8\u91cf\u540d\u79f0 \u53d6\u6d88\u73af\u5883\u53d8\u91cf<\/p>\n\n\n\n

4.shell\u53d8\u91cf\u8d4b\u503cread<\/h2>\n\n\n\n

\u9664\u4e86\u81ea\u5b9a\u4e49\u53d8\u91cf\uff0c\u4ee5\u53ca\u7cfb\u7edf\u5185\u7f6e\u53d8\u91cf\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528read\u547d\u4ee4\u901a\u8fc7\u4ea4\u4e92\u65b9\u5f0f\u4f20\u9012\u53d8\u91cf<\/p>\n\n\n\n

read\u9009\u9879<\/td>\u9009\u9879\u542b\u4e49<\/td><\/tr>
-p<\/td>\u6253\u5370\u4fe1\u606f<\/td><\/tr>
-t<\/td>\u9650\u5b9a\u65f6\u95f4<\/td><\/tr>
-s<\/td>\u4e0d\u56de\u663e<\/td><\/tr>
-n<\/td>\u6307\u5b9a\u5b57\u7b26\u4e2a\u6570<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

5.\u53d8\u91cf\u5220\u9664\u4e0e\u66ff\u6362<\/h2>\n\n\n\n

1\uff0e\u4ec0\u4e48\u662f\u53d8\u91cf\u66ff\u6362\uff1f<\/strong>
\u7b80\u5355\u6765\u8bf4\uff0c\u5c31\u662f\u5728\u4e0d\u6539\u53d8\u539f\u6709\u53d8\u91cf\u7684\u60c5\u51b5\u4e0b\uff0c\u5bf9\u53d8\u91cf\u8fdb\u884c\u66ff\u6362\u3002
2.\u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528\u53d8\u91cf\u66ff\u6362\uff1f<\/strong>
\u6bd4\u5982\uff1a\u6211\u4eec\u9700\u8981\u5bf9\u67d0\u4e2a\u53d8\u91cf\u7684\u503c\u8fdb\u884c\u6574\u6570\u6bd4\u8f83\uff0c\u4f46\u53d8\u91cf\u7684\u503c\u662f\u4e00\u4e2a\u5c0f\u6570\u3002\u600e\u4e48\u529e\uff1f\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u53d8\u91cf\u66ff\u6362\u7684\u65b9\u5f0f\uff0c\u5c06\u5c0f\u6570\u4f4d\u8fdb\u884c\u5220\u9664\uff0c\u7136\u540e\u518d\u8fdb\u884c\u6574\u6570\u6bd4\u5bf9\u3002
3.\u53d8\u91cf\u66ff\u6362\u7684\u51e0\u79cd\u65b9\u5f0f\u3002<\/strong><\/p>\n\n\n\n

\u53d8\u91cf<\/td>\u8bf4\u660e<\/td><\/tr>
${\u53d8\u91cf#\u5339\u914d\u89c4\u5219}<\/td>\u4ece\u5934\u5f00\u59cb\u5339\u914d\uff0c\u6700\u77ed\u5220\u9664<\/td><\/tr>
${\u53d8\u91cf##\u5339\u914d\u89c4\u5219}<\/td>\u4ece\u5934\u5f00\u59cb\u5339\u914d\uff0c\u6700\u957f\u5220\u9664<\/td><\/tr>
${\u53d8\u91cf%\u5339\u914d\u89c4\u5219}<\/td>\u4ece\u5c3e\u5f00\u59cb\u5339\u914d\uff0c\u6700\u77ed\u5220\u9664<\/td><\/tr>
${\u53d8\u91cf%%\u5339\u914d\u89c4\u5219}<\/td>\u4ece\u5c3e\u5f00\u59cb\u5339\u914d\uff0c\u6700\u957f\u5220\u9664<\/td><\/tr>
${\u53d8\u91cf\/\u65e7\u5b57\u7b26\u4e32\/\u65b0\u5b57\u7b26\u4e32}<\/td>\u66ff\u6362\u53d8\u91cf\u5185\u7684\u65e7\u5b57\u7b26\u4e32\u4e3a\u65b0\u5b57\u7b26\u4e32\uff0c\u53ea\u66ff\u6362\u7b2c\u4e00\u4e2a<\/td><\/tr>
${\u53d8\u91cf\/\/\u65e7\u5b57\u7b26\u4e32\/\u65b0\u5b57\u7b26\u4e32}<\/td>\u66ff\u6362\u53d8\u91cf\u5185\u7684\u65e7\u5b57\u7b26\u4e32\u4e3a\u65b0\u5b57\u7b26\u4e32\uff0c\u5168\u90e8\u66ff\u6362<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
[root@test \/server\/script]# url=www.baidu.com\n[root@test \/server\/script]# echo $url\nwww.baidu.com\n#\u4ece\u5934\u5339\u914d\u5230(.\u70b9)\u7136\u540e\u5220\u9664\u6700\u8fd1\u7684\u70b9\n[root@test \/server\/script]# echo ${url#*.}\nbaidu.com\n#\u4ece\u5934\u5339\u914d\u5230(.\u70b9)\u7136\u540e\u5220\u9664\u6700\u8fdc\u7684\u70b9\n[root@test \/server\/script]# echo ${url##*.}\nCom\n#\u4ece\u5c3e\u5339\u914d\u5230(.\u70b9)\u7136\u540e\u5220\u9664\u6700\u8fd1\u7684\u70b9\n[root@test \/server\/script]# echo ${url%.*}\nwww.baidu\n#\u4ece\u5c3e\u5339\u914d\u5230(.\u70b9)\u7136\u540e\u5220\u9664\u6700\u8fdc\u7684\u70b9\n[root@test \/server\/script]# echo ${url%%.*}\nwww\n#\u5c06.\u66ff\u6362\u4e3a\uff0c\u53ea\u66ff\u6362\u7b2c\u4e00\u4e2a\n[root@test \/server\/script]# echo ${url\/.\/,}\nwww,baidu.com\n#\u5c06.\u66ff\u6362\u4e3a\uff0c\u5168\u90e8\u66ff\u6362\n[root@test \/server\/script]# echo ${url\/\/.\/,}\nwww,baidu,com<\/code><\/pre>\n\n\n\n
6.\u53d8\u91cf\u7684\u5b50\u4e32\uff08\u5207\u7247\u53ca\u957f\u5ea6\u7edf\u8ba1\uff09<\/h2>\n\n\n\n
\u53d8\u91cf\u5207\u7247<\/strong><\/p>\n\n\n\n
[root@fsf \/server\/script]# url=www.buyao007.icu\n[root@fsf \/server\/script]# echo $url\nwww.buyao007.icu\n[root@fsf \/server\/script]# echo ${url:2:2}\nw.\n[root@fsf \/server\/script]# echo ${url:2:3}\nw.b<\/code><\/pre>\n\n\n\n
\u7edf\u8ba1\u53d8\u91cf\u5b50\u4e32\u7684\u957f\u5ea6<\/strong><\/p>\n\n\n\n
[root@fsf \/server\/script]# echo $url\nwww.buyao007.icu\n[root@fsf \/server\/script]# echo $url|wc -L\n16\n[root@fsf \/server\/script]# echo $[ `echo $url|wc -c`-1 ]\n16\n[root@fsf \/server\/script]# echo ${#url}\n16<\/code><\/pre>\n\n\n\n
awk\u7edf\u8ba1\u51fa\u53d8\u91cf\u4e2d\u7684\u957f\u5ea6\u5c0f\u4e8e3\u7684\u503c<\/strong><\/p>\n\n\n\n
[root@fsf \/server\/script]# name=\"I am sunfuyang I am 18\"\n[root@fsf \/server\/script]# echo $name\nI am sunfuyang I am 18\n[root@fsf \/server\/script]# echo $name|awk '{for(i=1;i<=NF;i++)if(length($i)<3)print $i}'\nI\nam\nI\nam\n18\n[root@fsf \/server\/script]# echo $name|xargs -n1|awk '{if(length<3)print}'\nI\nam\nI\nam\n18<\/code><\/pre>\n\n\n\n
7.\u53d8\u91cf\u7684\u6574\u6570\u8fd0\u7b97<\/h2>\n\n\n\n
1.\u4ec0\u4e48\u662f\u53d8\u91cf\u8fd0\u7b97\uff1f<\/strong>
\u5176\u5b9e\u5c31\u662f\u52a0\u51cf\u4e58\u9664
2.\u4e3a\u4ec0\u4e48\u8981\u5b66\u4e60\u53d8\u91cf\u8fd0\u7b97\uff1f<\/strong>
\u6bd4\u5982\uff1a\u5f53\u6211\u4eec\u9700\u8981\u5f00\u53d1\u4e00\u4e2a\u8ba1\u7b97\u5668\u7684\u65f6\u5019\u662f\u4e0d\u662f\u5c31\u9700\u8981\u8fd0\u7b97\u4e86\uff1f
3.\u53d8\u91cf\u8fd0\u7b97\u4f7f\u7528\u4ec0\u4e48\u65b9\u5f0f\u6765\u5b9e\u73b0<\/strong>\uff1f
\u901a\u5e38\u6574\u6570\u8fd0\u7b97\u6709expr\u3001$(())\u3001$[]\u3001let\u7b49\u65b9\u5f0f\uff0c\u5c0f\u6570\u8fd0\u7b97\u6709bc\u3001awk\u65b9\u5f0f\u3002<\/p>\n\n\n\n
\u64cd\u4f5c\u7b26<\/td>\u542b\u4e49<\/td><\/tr>
num1 + num2<\/td>\u52a0<\/td><\/tr>
num1 - num2<\/td>\u51cf<\/td><\/tr>
num1 * num2<\/td>\u79f0<\/td><\/tr>
num1 \/ num2<\/td>\u9664<\/td><\/tr>
num1 % num2<\/td>\u4f59<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
4.\u53d8\u91cf\u8fd0\u7b97\u57fa\u672c\u4f7f\u7528\u4e0e\u793a\u4f8b\uff1f<\/strong><\/p>\n\n\n\n
\u5b9a\u4e49\u53d8\u91cf\uff0c\u4f7f\u7528expr\u3001$(())\u3001$[]\u3001\u8fdb\u884c\u52a0\u51cf\u4e58\u9664\u3002expr\u5fc5\u987b\u7a7a\u683c\u9694\u5f00\u3002\n[root@test \/server\/script]# num1=10\n[root@test \/server\/script]# num2=20\n[root@test \/server\/script]# expr $num1 + $num2\n30\n[root@test \/server\/script]# echo $((num1+num2))\n30\n[root@test \/server\/script]# echo $((num1 + num2))\n30\n[root@test \/server\/script]# echo $[num1 + num2]\n30\n[root@test \/server\/script]# echo $[4 % 3]<\/code><\/pre>\n\n\n\n
let\u7684i++\u4e0e++i\u7684\u533a\u522b<\/strong>\n#\u76f4\u63a5\u505a\u8fd0\u7b97\u662f\u76f8\u540c\u7684\n[root@fsf \/server\/script]# let i++\n[root@fsf \/server\/script]# echo $i\n1\n[root@fsf \/server\/script]# let ++a\n[root@fsf \/server\/script]# echo $a\n1\n#\u5728\u53d8\u91cf\u4e2d\u662f\u4e0d\u4e00\u6837\u7684\n[root@fsf \/server\/script]# unset i\n[root@fsf \/server\/script]# unset a\n[root@fsf \/server\/script]# let i=a++\n[root@fsf \/server\/script]# echo $i\n0\n[root@fsf \/server\/script]# echo $a\n1\n[root@fsf \/server\/script]# let b=++c\n[root@fsf \/server\/script]# echo $b\n1\n[root@fsf \/server\/script]# echo $c\n1\nlet\u8fd0\u7b97 \u9700\u8981\u4f7f\u7528\u53d8\u91cf  \u53ea\u652f\u6301\u6574\u6570\u8fd0\u7b97\n[root@fsf \/server\/script]# let sum=1+1\n[root@fsf \/server\/script]# echo $sum\n2\n[root@fsf \/server\/script]# num1=10\n[root@fsf \/server\/script]# num2=20\n[root@fsf \/server\/script]# let count=$num1+$num2\n[root@fsf \/server\/script]# echo $count\n30\nbc \u652f\u6301\u5c0f\u6570\u548c\u6574\u6570\u8fd0\u7b97<\/strong>\n[root@m01-shell ~]# echo 10+10|bc\n20\n[root@m01-shell ~]# echo 10*10|bc\n100\n[root@m01-shell ~]# echo 10-10|bc\n0\n[root@m01-shell ~]# echo 10-10.5|bc\n-.5\nawk\u8fd0\u7b97<\/strong>\n[root@m01-shell ~]# awk 'BEGIN{print 10+10}'\n20\n[root@m01-shell ~]# awk 'BEGIN{print 10-10}'\n0\n[root@m01-shell ~]# awk 'BEGIN{print 10+100}'\n110\n[root@m01-shell ~]# awk 'BEGIN{print 10+100\/2}'\n60\n[root@m01-shell ~]# awk 'BEGIN{print 10+100\/2*4}'\n210\n[root@m01-shell ~]# echo 10 20\n10 20\n[root@m01-shell ~]# echo 10 20|awk '{print $1+$2}'\n30<\/code><\/pre>\n\n\n\n
5.\u6574\u6570\u8fd0\u7b97\u6848\u4f8b<\/strong><\/p>\n\n\n\n
\u6848\u4f8b: \u5224\u65ad\u6211\u4eec\u8f93\u5165\u7684\u6570\u5b57\u662f\u5426\u4e3a\u6574\u6570\n[root@fsf \/server\/script]# cat count.sh \n#!\/bin\/bash\nread -p \"\u8bf7\u8f93\u5165\u7b2c\u4e00\u4e2a\u6574\u6570\" a\nread -p \"\u8bf7\u8f93\u5165\u52a0\u51cf\u4e58\u9664\u6216\u5176\u4ed6\u8fd0\u7b97\u7b26\u53f7\" c\nread -p \"\u8bf7\u8f93\u5165\u7b2c\u4e8c\u4e2a\u6574\u6570\" b\nexpr $a + $b &>\/dev\/null\nif [ $? -eq 0 ];then\nd=$(awk 'BEGIN{print '$a' '$c' '$b'}')\necho \"\u4f60\u8981\u8fd0\u7b97\u7684\u662f$a$c$b=$d\"\nelse\necho \"\u4f60\u8f93\u5165\u7684\u4e0d\u662f\u6574\u6570\uff0c\u6216\u7279\u6b8a\u5b57\u7b26\u672a\u8f6c\u4e49\"\nfi<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u5b59\u5bcc\u9633\uff0c \u6c5f\u6e56\u4eba\u79f0\u6ca1\u4eba\u79f0\u3002\u591a\u5e74\u4e92\u8054\u7f51\u8fd0\u7ef4\u5de5\u4f5c\u7ecf\u9a8c\uff0c\u66fe\u8d1f\u8d23\u8fc7\u5b59\u5e03\u65af\u5927\u89c4\u6a21\u96c6\u7fa4\u67b6\u6784\u81ea\u52a8\u5316\u8fd0\u7ef4\u7ba1\u7406\u5de5\u4f5c\u3002\u64c5\u957fWeb\u96c6 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"_links":{"self":[{"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=\/wp\/v2\/posts\/299"}],"collection":[{"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=299"}],"version-history":[{"count":4,"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=\/wp\/v2\/posts\/299\/revisions"}],"predecessor-version":[{"id":305,"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=\/wp\/v2\/posts\/299\/revisions\/305"}],"wp:attachment":[{"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=299"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=299"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.buyao007.icu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=299"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}