Return true value (POSIX)
The true utility does nothing but exit immediately with a zero exit code.
The true utility is typically used in shell scripts. One common application is to create an infinite loop, as in:
while true do myprogram sleep 300 done
which runs myprogram every five minutes (300 seconds) until the shell script is interrupted.
The shell has a builtin true command; see ksh. To make sure you use the executable, specify the full path.