2004-11-03 13:51:07 +00:00
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.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
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2007-06-20 22:33:04 +00:00
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.TH "SHIFT" 1P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
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2004-11-03 13:51:07 +00:00
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.\" shift
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2007-09-20 06:03:25 +00:00
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.SH PROLOG
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This manual page is part of the POSIX Programmer's Manual.
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The Linux implementation of this interface may differ (consult
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the corresponding Linux manual page for details of Linux behavior),
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or the interface may not be implemented on Linux.
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2004-11-03 13:51:07 +00:00
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.SH NAME
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shift \- shift positional parameters
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.SH SYNOPSIS
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.LP
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\fBshift\fP \fB[\fP\fIn\fP\fB]\fP
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.SH DESCRIPTION
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.LP
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The positional parameters shall be shifted. Positional parameter 1
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shall be assigned the value of parameter (1+\fIn\fP),
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parameter 2 shall be assigned the value of parameter (2+\fIn\fP),
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and so on. The parameters represented by the numbers
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\fB"$#"\fP down to \fB"$#-n+1"\fP shall be unset, and the parameter
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\fB'#'\fP is updated to reflect the new number of
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positional parameters.
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.LP
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The value \fIn\fP shall be an unsigned decimal integer less than or
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equal to the value of the special parameter \fB'#'\fP .
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If \fIn\fP is not given, it shall be assumed to be 1. If \fIn\fP is
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0, the positional and special parameters are not changed.
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.SH OPTIONS
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.LP
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None.
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.SH OPERANDS
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.LP
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See the DESCRIPTION.
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.SH STDIN
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.LP
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Not used.
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.SH INPUT FILES
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.LP
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None.
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.SH ENVIRONMENT VARIABLES
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.LP
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None.
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.SH ASYNCHRONOUS EVENTS
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.LP
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Default.
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.SH STDOUT
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.LP
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Not used.
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.SH STDERR
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.LP
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The standard error shall be used only for diagnostic messages.
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.SH OUTPUT FILES
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.LP
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None.
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.SH EXTENDED DESCRIPTION
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.LP
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None.
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.SH EXIT STATUS
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.LP
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The exit status is >0 if \fIn\fP>$#; otherwise, it is zero.
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.SH CONSEQUENCES OF ERRORS
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.LP
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Default.
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.LP
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\fIThe following sections are informative.\fP
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.SH APPLICATION USAGE
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.LP
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None.
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.SH EXAMPLES
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.sp
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.RS
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.nf
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\fB$\fP \fBset a b c d e
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\fP\fB$\fP \fBshift 2
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\fP\fB$\fP \fBecho $*
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\fP\fBc d e\fP
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.fi
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.RE
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.SH RATIONALE
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.LP
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None.
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.SH FUTURE DIRECTIONS
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.LP
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None.
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.SH SEE ALSO
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.LP
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\fISpecial Built-In Utilities\fP
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group. In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.opengroup.org/unix/online.html .
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