2020 年 11月随笔档案 - ZhangZhihuiAAA

Sed - search, print, replace

摘要：Search and print matched lines: scnzzh@ZUBT1:~/zzh$ sed -n '/ExecStart/p' docker.service ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/contain 阅读全文

posted @ 2020-11-24 11:35 ZhangZhihuiAAA 阅读(104) 评论(0) 推荐(0) 编辑

bash - ERROR: binary operator expected

摘要：scnzzh@ZUBT:~

r e =^{' [} 0 - 9] +

$re='^[0-9]+$ ' scnzzh@ZUBT:~

a = 001 s c n z z h @ Z U B T :

$a=001 scnzzh@ZUBT:~$ b=a12 scnzzh@ZUBT:~

i f [

$if [$ a =~ $re ]; then echo 'yyy'; fi bash: [: =~: binary operat 阅读全文

posted @ 2020-11-23 16:33 ZhangZhihuiAAA 阅读(1079) 评论(0) 推荐(0) 编辑

Shell - automatically trim

摘要：zzh@ZZHPC:~

a =" a a a a a a " z z h @ Z Z H P C :

$a=" aaa aaa " zzh@ZZHPC:~$ echo "

a " a a a a a a z z h @ Z Z H P C :

$a" aaa aaa zzh@ZZHPC:~$ echo

a a a a a a a z z h @ Z Z H P C :

$a aaa aaa zzh@ZZHPC:~$ b="bbb

a b b b " z z h @ Z Z H P C :

${a}bbb" zzh@ZZHPC:~$ echo "$b" bbb aaa aaa 阅读全文

posted @ 2020-11-13 09:15 ZhangZhihuiAAA 阅读(79) 评论(0) 推荐(0) 编辑

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