sed commands

Eliminate comments

bash$ sed -e 's/#.*//' /etc/inetd

Eliminate comments and empty lines

bash$ sed -e 's/#.*//;/^$/d' /etc/inetd

Have a 133t prompt

bash$ ls -l | sed -e 's/o/0/;s/l/1/;s/e/3/'

bash$ ls -l | sed -e 's/o/0/g;s/l/1/g;s/e/3/g'

bash$ ls -l | sed -e 'y/ole/013/g'