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.
Use colonposix online using onworks.net services
