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Warning: main() [function.include]: Failed opening '/www/www/htdocs/style/globals.php' for inclusion (include_path='.:/www/www/common:/www/www/php/lib/php') in /www/www/docs/6.4.1/neutrino/utilities/t/true.html on line 1

Warning: main(/www/www/htdocs/style/header.php) [function.main]: failed to open stream: No such file or directory in /www/www/docs/6.4.1/neutrino/utilities/t/true.html on line 8

Warning: main() [function.include]: Failed opening '/www/www/htdocs/style/header.php' for inclusion (include_path='.:/www/www/common:/www/www/php/lib/php') in /www/www/docs/6.4.1/neutrino/utilities/t/true.html on line 8

true

Return true value (POSIX)

Syntax:

true

Runs on:

QNX Neutrino, Microsoft Windows

Options:

None.

Description:

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.

Exit status:

0

See also:

false, ksh


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