NAME

shift — shift positional parameters

SYNOPSIS

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

xcu_chap02(1)

CHANGE HISTORY

Issue 6

IEEE Std 1003.1-2001 (“POSIX.1”)/Cor 1-2002, item XCU/TC1/D6/5 is applied so that the reference page sections use terms as described in the Utility Description Defaults ( xcu_chap01(1)). No change in behavior is intended.

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