Content

Go-to Command:

grep -IRil "pattern" /path/to/search

-a Includes hidden files/dirs. -I Ignore binaries (.bin, .jpg, etc) -R Recursive + follows all symlinks -i Case-insensitive -l Shows only filenames with pattern in the content

grep -IRil "password|passphrase|secret" /path/to/search	Multiple keywords
grep -IRil --include=*.txt "pattern" /path/to/search	File extensions
grep -v "pattern" /path/to/search	Inverse
grep -vE "(pattern1) | (pattern2)" file.txt	Multiple inverse patterns
zgrep -Iil "pattern" /path/to/search	Basic pattern match
zgrep -Iil "pattern1|pattern2|pattern3" /path/to/search	Multiple keywords (Compressed files)
zgrep -Iil --include=*.gz "pattern" /path/to/search	File extensions (Compressed files)
find / -a -type f -name "*.gz" -exec zgrep "pattern" {} +	Recursive zgrep
find / -a -type f -exec grep -Iil "pattern" {} + 2>/dev/null	Search the contents of all files for string. Return filenames.
find / -a -type f -name "*.java" -exec grep -il 'pattern' {} \;	Ignore case with -i option
find / -a -type f -empty -exec ls -l {} \;	Empty Files
find / -a -type f -name "*.gz" -exec zgrep 'pattern'{} \;	Search for a string in gzip'd files