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egrep
Find the specified string in the file
Supplementary Note:
egrepThe command is used to find the specified string in the file. Its execution effect is grep -Esimilar to that of , and the syntax and parameters used can refer to grepthe command. The difference lies in the method of interpreting the string. egrepIt is interpreted using extended regular expressiongrammar and interpreted grepusing basic regular expressiongrammar. A more standardized expression extended regular expressionthan .basic regular expression
grammar
egrep [选项] [查找模式] [文件名1，文件名2，……]
example
Display the matching characters in the file. For example, to find all files in the current directory that contain the string "Linux", you can use the following command:
egrep Linux *
The result looks like this:
# 以下五行为 testfile 中包含Linux字符的行
testfile:hello Linux!
testfile:Linux is a free Unix-type operating system.
testfile:This is a Linux testfile!
testfile:Linux
testfile:Linux
# 以下两行为testfile1中含Linux字符的行
testfile1:helLinux!
testfile1:This a Linux testfile!
# 以下两行为 testfile_2 中包含Linux字符的行
testfile_2:Linux is a free unix-type operating system
testfile_2:Linux test
Filter comment lines and blank lines
egrep -v '^\s*(#|$)' filename
The above command is used to filter out comment lines and blank lines in the file.
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