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.
SEE ALSO
Special Built-In Utilities
COPYRIGHT
Portions of this text are reprinted and
reproduced in electronic form from IEEE Std 1003.1, 2003 Edition,
Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 6,
Copyright (C) 2001-2003 by the Institute of Electrical and
Electronics Engineers, Inc and The Open Group. In the event of any
discrepancy between this version and the original IEEE and The Open
Group Standard, the original IEEE and The Open Group Standard is
the referee document. The original Standard can be obtained online
at http://www.opengroup.org/unix/online.html
.