huschi.net

SHIFT(1P)                  POSIX Programmer's Manual                 SHIFT(1P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the  corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.
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 repre-
       sented  by  the  numbers  "$#" down to "$#-n+1" shall be unset, and the
       parameter '#' is updated to reflect the new number of positional param-
       eters.
       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 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 .

IEEE/The Open Group                  2003                            SHIFT(1P)