system("at 17:00 echo \"go home\"");
system("at");
system("at 1 /delete");

##</code><code>##

Added a new job with job ID = 1
Status ID   Day                     Time          Command Line
-------------------------------------------------------------------------------
        1   Next 20                 17:00         echo "go home"

##</code><code>##

system('at 12:00 program ""the.server.org:1234""')