Grep
From charlesreid1
Search a file for a pattern
grep pattern file
Case insensitive search (with line numbers)
grep -in pattern file
Case insensitive search that ignores binary files (with line numbers):
grep -I -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
Match lines starting with 00
grep "^00" file
Find IP address:
grep -E "[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}" file
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: ssh -> [s]sh
ps aux | grep '[h]ttpd'
Colour in red {bash} and keep all other lines
ps aux | grep -E --color 'bash|$'