plucky (1) shift.1posix.gz

Provided by: manpages-posix_2017a-2_all bug

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


       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard
       for  Information  Technology  --  Portable  Operating  System  Interface  (POSIX),  The  Open  Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

       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 .