Show diff output in color

alias cpatch='sed -e "s/^+.*$/`tput setf 6 bold`&`tput sgr0`/" \
                  -e "s/^-.*$/`tput setf 4 bold`&`tput sgr0`/"'

Explanation

tput sgr0

Turn off all attributes.

tput setf 4 bold

Set foreground color to Bold Red.

tput setf 6 bold

Set foreground color to Bold Yellow.

Check the documentation for tput(1) and terminfo(5) for more terminal capability definitions.

Example output