CentOS Linux Server Guide

Finding character strings in CentOS Linux

grep command is used to search or given character in files.

Command and Options:

grep [options] pattern filename(s)

Option:

Options Description

-n display lines together with oine number

-c display only total number of lines that matched the pattern

-i ignore case distinctions in both the pattern and the input files

-v display all lines that don't match the given pattern

-f filename take list of patterns from a file, one line per time

-C display leading lines before and trailing and trailing text after matching lines

Examples:

The following example "fail" string in error.log. If matched, it will output all matched line to screen

grep fail error.log

The following example,will display 2 lines of leading and trailing context arounf the matched lines

grep -C2 james namelist.txt

The following example will display total count of matched lines

grep -c james namelist.txt

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