Example of using the sleep command

1. To set an interval before a command is executed:

   sleep 20; ls -l &
   cd $HOME/Mail
   ...
   ...
   -rw-------  1 erpl08       4761 Jul 17  1992 IUSC_Conference
   drwx------  2 erpl08        512 Jun  5  1992 SGML
   drwx------  2 erpl08        512 Mar 15  1991 drafts

This gives the user 20 seconds to change to another directory before the command ls -l is executed to list the contents of the current directory $HOME/Mail.

The first command line is run as a background job to allow the user to continue entering commands.