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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 dif-
       fer (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 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, Stan-
       dard  for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifica-
       tions 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 Stan-
       dard, 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)