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UNIX for Dummies Questions & Answers
Positional parameters
Post 302146764 by ranj@chn on Thursday 22nd of November 2007 06:53:45 AM
11-22-2007
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LEARN ABOUT LINUX
shift
SHIFT(P) POSIX Programmer's Manual SHIFT(P) NAME
shift - shift positional parameters SYNOPSIS
shift [n] DESCRIPTION
The positional parameters shall be shifted. Positional parameter 1 shall be assigned the value of parameter (1+n), parameter 2 shall be assigned the value of parameter (2+n), and so on. The parameters represented by the numbers "$#" down to "$#-n+1" shall be unset, and the parameter '#' is updated to reflect the new number of positional parameters. The value n shall be an unsigned decimal integer less than or equal to the value of the special parameter '#' . If n is not given, it shall be assumed to be 1. If n is 0, the positional and special parameters are not changed. 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
The exit status is >0 if n>$#; otherwise, it is zero. CONSEQUENCES OF ERRORS
Default. The following sections are informative. APPLICATION USAGE
None. EXAMPLES
$ set a b c d e $ shift 2 $ echo $* c d e 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 Technol- ogy -- 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 . IEEE
/The Open Group 2003 SHIFT(P)