Linux Search Filter--grep

grep is often used when querying messages on the server, summarizing several common, simple commands, and mastering them to make queries more efficient.

Basic format:

grep [option] Pattern file

Several important command parameters, which are not listed here, only list the ones that may be commonly used for quick query:

In addition to any parameters that indicate that the search conforms to the content of the style after, the remaining parameters are:

   -v--revert-   match    -i--ignore-case   #忽略字符大小写的差别.    -   n--line-   number #在显示符合样式的那一行之前, indicating the column number of the row.     -C--count   #计算符合样式的列数.

Example:

[Email protected] yyy]$ grep-c'MONGO'Nohup. outGrep:nohup. out: Permission denied[[email protected] yyy]$ sudo grep-C'MONGO'Nohup. out 10633[[email protected] yyy]$ sudo grep-V' not'stop.sh #!/bin/shprocess= ' Ps-ef|grep zzz|grep-v grep|grep-v Ppid|awk'{print $}'' num= ' Ps-ef|grep zzz|grep-v GREP|WC-l ' forIinch$PROCESS DoEcho"Kill the consumer process [$i]"Kill-9$idoneecho"$num processes be killed"[[email protected] yyy]$ sudo grep-i ppid stop.sh PROCESS= ' Ps-ef|grep zzz|grep-v grep|grep-v Ppid|awk'{print $}'' [[email protected] yyy]$ sudo grep-N-I ppid stop.sh2:P rocess= ' Ps-ef|grep zzz|grep-v grep|grep-v Ppid|awk'{print $}'`

If you combine grep with a regular expression, you can make the tool more powerful, documenting several common regular expressions that you can use with the grep parameter:

\< #锚定单词的开始    such as:'\<grep' matches lines that contain words that begin with grep.    \> #锚定单词的结束    like 'grep\>' matches a line that contains a word that ends with grep ^   #锚定行的开始     such as:'^grep' matches all lines that begin with grep.    $  #锚定行的结束     such as:'grep$' matches all lines that end with grep.
[] #匹配一个指定范围内的字符
such as ' [Gg]rep ' matches grep and GRE

Example:

[email protected] yyy]$ sudo grep-n'\<grep'stop.sh2:P rocess= ' Ps-ef|grep zzz|grep-v grep|grep-v Ppid|awk'{print $}'`3: num= ' Ps-ef|grep zzz|grep-v GREP|WC-l ' [[email protected] yyy]$ sudo grep-N'^e'stop.sh9: Echo"$num processes be killed"[[email protected] yyy]$ sudo grep-N'i$'stop.sh7: Kill-9$i [[email protected] yyy]$ sudo grep-N [gg]rep stop.sh2:P rocess= ' Ps-ef|grep zzz|grep-v grep|grep-v Ppid|awk'{print $}'`3: num= ' ps-ef|grep zzz|grep-v grep|wc-l '

Finally, if you need to output the contents of the query to text, you can:

[email protected] yyy]$ lltotal59976-rwxrwxrwx1Root root0Oct +  -: - 1. TXTDRWXR-xr-x2Root root4096May to  -: $Lib-rw-r--r--1Root root39936Jul -  the: -Zzz.jar-rw-r--r--1Root root39792June3  -: -Zzz.jar.20160714-rw-r--r--1Root root39835Jul -  the: toZzz.jar.20160718-RW-------1Root root61218369Oct +  -: -Nohup. out-rw-r--r--1Root root275June1  the: tostop.sh[[email protected] yyy]$ sudo grep'MONGO'Nohup. out>1. txt [[email protected] yyy]$ lltotal61184-rwxrwxrwx1Root root1159937Oct +  -: - 1. TXTDRWXR-xr-x2Root root4096May to  -: $Lib-rw-r--r--1Root root39936Jul -  the: -Zzz.jar-rw-r--r--1Root root39792June3  -: -Zzz.jar.20160714-rw-r--r--1Root root39835Jul -  the: toZzz.jar.20160718-RW-------1Root root61286858Oct +  -: -Nohup. out-rw-r--r--1Root root275June1  the: tostop.sh

Linux Search Filter--grep