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→Grep with blanks
{| class="wikitable"
{| class="wikitable"
|-
|-
! Option !! Description !! Example
!Option!!Description!!Example
|-
|-
| -c || Count || grep -c 'root' /etc/passwd
| -c||Count||grep -c 'root' /etc/passwd
|-
|-
| -e || Specify multiple search patterns || grep -e 'root' -e 'system' /etc/passwd
| -e||Specify multiple search patterns||grep -e 'root' -e 'system' /etc/passwd
|-
|-
| -r || Recursive ||
| -r||Recursive||
|-
|-
| -v || Show lines not matching the pattern ||
| -v||Show lines not matching the pattern||
|-
|-
| -i || Case insensitive ||
| -i||Case insensitive||
|-
|-
| -n || Output line numbering ||
| -n||Output line numbering||
|-
|-
| -E || Enable regex use (similar to egrep) ||
| -E||Enable regex use (similar to egrep)||
|-
|-
| -o || Show only the match, not the full line ||
| -o||Show only the match, not the full line||
|-
|-
| -f FILE || Specify file to search in. ||
| -f FILE||Specify file to search in.||
|-
|-
| -H || Print file name ||
| -H||Print file name||
|-
| -P
|Perl Regex
|grep -P '\d{16}'
|}
|}
grep -Eio '[a-z0-9._-]+@[a-z0-9.-]+[a-z]{2,4}' file.txt # Extract e-main addresses from file.txt</source>
grep -Eio '[a-z0-9._-]+@[a-z0-9.-]+[a-z]{2,4}' file.txt # Extract e-main addresses from file.txt</source>
== Find files containing text pattern ==
==Find files containing text pattern==
grep -rnw '/path/' -e "pattern"
grep -rnw '/path/' -e "pattern"
* -r or -R is recursive,
*-r or -R is recursive,
* -n is line number, and
*-n is line number, and
* -w stands match the whole word.
*-w stands match the whole word.
* -l (lower-case L) can be added to just give the file name of matching files.
*-l (lower-case L) can be added to just give the file name of matching files.
--exclude or --include parameter could be used for efficient searching. Something like below:
--exclude or --include parameter could be used for efficient searching. Something like below:
grep --include=\*.{c,h} -rnw '/path/to/somewhere/' -e "pattern"
grep --include=\*.{c,h} -rnw '/path/to/somewhere/' -e "pattern"
grep --exclude=*.o -rnw '/path/to/somewhere/' -e "pattern"
grep --exclude=*.o -rnw '/path/to/somewhere/' -e "pattern"
grep --exclude-dir={dir1,dir2,*.dst} -rnw '/path/to/somewhere/' -e "pattern"
grep --exclude-dir={dir1,dir2,*.dst} -rnw '/path/to/somewhere/' -e "pattern"
==Remove comments and blank lines==
cat /etc/apache2/sites-enabled/default-ssl.conf | grep -v '^$\|^\s*\#'
==Grep with blanks==
<syntaxhighlight lang="bash">
cat dig_output.txt | grep -E 'INblank:A'
cat LogsAndreaPasswords.csv | awk -F ',' '{print $1 "," $2}' | uniq -c | sort -n | grep '^\s*1 '
</syntaxhighlight>
==Grep remove comments and blank lines==
<syntaxhighlight lang="bash">
cat file.txt | grep -v ^\#|grep .
</syntaxhighlight>