true or false Command Purpose Returns an exit value of zero (true) or a nonzero exit value (false). Syntax true false Description The true command returns a zero exit value. The false command returns a nonzero exit value. These commands are most often used as part of a shell script. Examples To construct a loop that displays the date and time once each minute, use the following code in a shell script: while true do date sleep 60 done Implementation Specifics These commands are part of Base Operating System (BOS) Runtime. Related Information How to Create and Run a Shell Script in AIX Version 3.2 System User's Guide: Base and Devices provides information on creating and executing shell procedures. Commands Overview in AIX Version 3.2 System User's Guide: Base and Devices.