1. Perform same task on set of files. Example below run Table programs only:
   bash -c 'for pgm in $(ls t_*.sas); do sas ${pgm}; read -p "Press Eneter..."; done'
   bash -c 'for pgm in $(ls t_*.sas); do sas ${pgm}; read var1; done'
   
2. Show only filename owned by a user. Usefule if need to create a list of programs.
   ls -l *.sas | grep username | awk '{print $9}'
   
3. Pass an argument to script prompt. Useful when running script without user interaction.
   echo 3 | getdesc | ggrep -A 2 imisc201310b