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colonposix - Online in the Cloud

Run colonposix in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command colonposix that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

NAME


colon — null utility

SYNOPSIS


: [argument...]

DESCRIPTION


This utility shall only expand command arguments. It is used when a command is needed, as
in the then condition of an if command, but nothing is to be done by the command.

OPTIONS


None.

OPERANDS


See the DESCRIPTION.

STDIN


Not used.

INPUT FILES


None.

ENVIRONMENT VARIABLES


None.

ASYNCHRONOUS EVENTS


Default.

STDOUT


Not used.

STDERR


The standard error shall be used only for diagnostic messages.

OUTPUT FILES


None.

EXTENDED DESCRIPTION


None.

EXIT STATUS


Zero.

CONSEQUENCES OF ERRORS


Default.

The following sections are informative.

APPLICATION USAGE


None.

EXAMPLES


: ${X=abc}
if false
then :
else echo $X
fi
abc

As with any of the special built-ins, the null utility can also have variable assignments
and redirections associated with it, such as:

x=y : > z

which sets variable x to the value y (so that it persists after the null utility
completes) and creates or truncates file z.

RATIONALE


None.

FUTURE DIRECTIONS


None.

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