Getting Started

Option	Example	Operation
`-i`	grep -i ^DA demo.txt	Forgets about case sensitivity
`-w`	grep -w "of" demo.txt	Search only for the full word
`-A`	grep -A 3 'Exception' error.log	Display 3 lines after matching string
`-B`	grep -B 4 'Exception' error.log	Display 4 lines before matching string
`-C`	grep -C 5 'Exception' error.log	Display 5 lines around matching string
`-r`	grep -r 'quickref.me' /var/log/nginx/	Recursive search (within subdirs)
`-v`	grep -v 'warning' /var/log/syslog	Return all lines which don't match the pattern
`-e`	grep -e '^al' filename	Use regex (lines starting with 'al')
`-E`	grep -E 'ja(s	cks)on' filename
`-c`	grep -c 'error' /var/log/syslog	Count the number of matches
`-l`	grep -l 'robot' /var/log/*	Print the name of the file(s) of matches
`-o`	grep -o search_string filename	Only show the matching part of the string
`-n`	grep -n "go" demo.txt	Show the line numbers of the matches

Search standard output (i.e. a stream of text)

$ grep [options] search\_string

Search for an exact string in file:

$ grep [options] search\_string path/to/file

Print lines in myfile.txt containing the string "mellon"

$ grep 'mellon' myfile.txt

Wildcards are accepted in filename.

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