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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 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
       If the n operand is invalid or is greater than "$#", this may  be  con-
       sidered  a  syntax  error  and a non-interactive shell may exit; if the
       shell does not exit in this case,  a  non-zero  exit  status  shall  be
       returned. Otherwise, zero shall be returned.
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
       Section 2.14, Special Built-In Utilities
COPYRIGHT
       Portions  of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  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.unix.org/online.html .
       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,  see  https://www.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                            SHIFT(1P)