Difference between revisions of "Linux comand: grep"

Revision as of 08:24, 11 November 2015

Command-line utility to search lines matching regular expresions in plain-text data sets.

Option	Description	Example
-c	Count	grep -c 'root' /etc/passwd
-e	Specify multiple search patterns	grep -e 'root' -e 'system' /etc/passwd
-r	Recursive
-v	Show lines not matching the pattern
-i	Case insensitive
-n	Output line numbering
-E	Enable regex use (similar to egrep)
-o	Show only the match, not the full line
-f FILE	Example
-H	Print file name

Examples:

grep '\<a.*\>' archivo
cat archivo | grep "\<a.*\>"
grep "#" /boot/grub/menu.lst
grep -v "#" /boot/grub/menu.lst
grep -c "iface" /etc/network/interfaces
grep -e "root" -e "password" archivo
grep -n -e "root" -e "password" archivo
grep -r "password" *
ifconfig eth0 | grep -oiE '([0-9A-F]{2}:){5}[0-9A-F]{2}' # Show eth0 MAC address
grep -Eio '[a-z0-9._-]+@[a-z0-9.-]+[a-z]{2,4}' file.txt  # Extract e-main addresses from file.txt

@@ Line 9: / Line 9: @@
 | -e || Specify multiple search patterns || grep -e 'root' -e 'system' /etc/passwd
 |-
-| -r || Recursive || Example
+| -r || Recursive ||
 |-
-| -v || Show lines not matching the pattern || Example
+| -v || Show lines not matching the pattern ||
 |-
-| -i || Case insensitive || Example
+| -i || Case insensitive ||
 |-
-| -n || Output line numbering || Example
+| -n || Output line numbering ||
 |-
-| -E || Enable regex use (similar to egrep) || Example
+| -E || Enable regex use (similar to egrep) ||
 |-
-| -o || Show only the match, not the full line || Example
+| -o || Show only the match, not the full line ||
 |-
-| -f FILE || Example || Example
+| -f FILE || Example ||
 |-
-| -H || Print file name || Example
+| -H || Print file name ||
-|-
-| Example || Example || Example
 |}

Difference between revisions of "Linux comand: grep"

Revision as of 08:24, 11 November 2015

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