➜ cheat grep
# Search a file for a pattern
grep pattern file
# Case insensitive search (with line numbers)
grep -in pattern file
# Recursively grep for string <pattern> in folder:
grep -R pattern folder
# Read search patterns from a file (one per line)
grep -f pattern_file file
# Find lines NOT containing pattern
grep -v pattern file
# You can grep with regular expressions
grep "^00" file #Match lines starting with 00
grep -E "[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}" file #Find IP add
# Find all files which match {pattern} in {directory}
# This will show: "file:line my research"
grep -rnw 'directory' -e "pattern"
# Exclude grep from your grepped output of ps.
# Add [] to the first letter. Ex: sshd -> [s]shd
ps aux | grep '[h]ttpd'
# Colour in red {bash} and keep all other lines
ps aux | grep -E --color 'bash|$'