[Linux manuál]
Návod, kniha: POSIX Programmer's Manual
As with any of the special built-ins, the null utility can also have variable
assignments and redirections associated with it, such as:
which sets variable x to the value y (so that it persists after
the null utility completes) and creates or truncates file z.
colon: nulová utilita
Originální popis anglicky: colon - null utilityNávod, kniha: POSIX Programmer's Manual
STRUČNĚ
: [argument ...]POPIS / INSTRUKCE
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.PŘÍKLADY POUŽITÍ
: ${X=abc}
if false
then :
else echo $X
fi
abc
x=y : > z
RATIONALE
None.FUTURE DIRECTIONS
None.SOUVISEJÍCÍ
Special Built-In UtilitiesCOPYRIGHT
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 .| 2003 | IEEE/The Open Group |