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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
       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
       If  the  n  operand  is invalid or is greater than "$#", this may be considered 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 Electrical 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.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                                   2013                                         SHIFT(1POSIX)