Colouring grep output, modifying welcome message.
Reference on colours.
Some ways to do it
grep --color=always grep --color -E 'pattern|$' file grep --color 'pattern\|$' file egrep --color 'pattern|$' file
export GREP_OPTIONS='--color=always'
Alternatively, use ack. No file required, recursive by default.
ack -i pattern
The ultimate solution, use ack --cathy! Do not forget to install it first.
sudo apt-get install ack