The grep egrep for Linux text processing

The Three Musketeers of text processing under Linux

The first sword grep, Egrep, Fgrep: Text Search tool; Search operations on given text based on "pattern";

The second Sword Sed:stream editor, stream editor, line editing tools, text editing tools;

Third Sword Awk:gnu awk, text formatting tool; Text Report Generator;

Today, we mainly explain the first sword:

grep family:

grep: Supports the use of basic regular expressions;

Egrep: Supports the use of extended regular expressions;

grep: The use of regular expressions is not supported;

grep command:

Function: Text Search tool, according to the user specified "pattern (filter)" to match the target text line by row to check, print out the qualifying line;

Pattern: The filter condition written by the text character and the regular expression meta-character;

This article is from the "Li Wenming blog" blog, make sure to keep this source http://liwenming18.blog.51cto.com/11068518/1748919

The grep egrep for Linux text processing