2,306
edits
Changes
Jump to navigation
Jump to search
Line 1:
Line 1: − exclude words in grep search:+ − grep -v "text to exclude"+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
no edit summary
Command-line utility to search lines matching regular expresions in plain-text data sets.
{| class="wikitable"
|-
! Option !! Description !! Example
|-
| -c || Count || grep -c 'root' /etc/passwd
|-
| -e || Specify multiple search patterns || grep -e 'root' -e 'system' /etc/passwd
|-
| -r || Recursive || Example
|-
| -v || Show lines not matching the pattern || Example
|-
| -i || Case insensitive || Example
|-
| -n || Output line numbering || Example
|-
| -E || Enable regex use (similar to egrep) || Example
|-
| -o || Show only the match, not the full line || Example
|-
| -f FILE || Example || Example
|-
| -H || Print file name || Example
|-
| Example || Example || Example
|}
Examples:
<source lang="bash">
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
</source>