Shulou(Shulou.com)06/02 Report--

Xiaobian to share with you the use of linux egrep command in the file to find the specified string, I hope you read this article after the harvest, let us discuss it together!

The egrep command looks for a specified string in a file.

egrep is similar to grep -E in terms of syntax and parameters, but differs from grep in the way it interprets strings.

The egrep command is an extended version of grep, improving many operations that traditional grep cannot or does not facilitate. For example:

Not supported by grep? With + these two modifiers, but egrep can.

Grep does not support a| b or (abc| xyz) such "or one" alignment, but egrep can.

Grep requires\{and\} when dealing with {n,m}, but egrep does not.

Syntax format: egrep [parameters] [file]

Common parameters:

Reference Example

Filter files that contain one or more characters of "a":

[root@linuxcool ~]# egrep 'a+' linuxcool.txt

Filter strings containing abc or 123 characters:

[root@linuxcool ~]# egrep 'abc|123' linuxcool.txt

Filter characters that contain abc as a whole:

[root@linuxcool ~]# egrep '(abc)' linuxcool.txt

Filter one or more characters containing abc as a whole:

[root@linuxcool ~]# egrep '(abc)+' linuxcool.txt After reading this article, I believe you have a certain understanding of using the linux egrep command to find the specified string in the file. If you want to know more, welcome to pay attention to the industry information channel. Thank you for reading!

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