PWB1/usr/man/man1/shift.1

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.th SHIFT I 5/31/77
.sh NAME
shift \*- adjust Shell arguments
.sh SYNOPSIS
.bd shift
[ digit ]
.sh DESCRIPTION
.it Shift
is used in Shell command files to shift the
argument list left by 1,
so that old
.bd $2
can now be referred to by
.bd $1
and so forth.
.it Shift
is useful to iterate over several arguments
to a command file.
For example, the command file
.s3
.nf
.if n .ta 8
.if t .ta .5i
while "$1"
	pr \*-3 $1
	shift
end
.fi
.s3
.i0
prints each of its arguments in 3-column format.
.s3
.it Shift
is executed within the Shell.
.s3
The optional argument causes
.it shift
to leave shell arguments numbered lower than
.it $digit
alone on shifts;
.it shift
alone and
.it "shift 1"
are identical in effect.
.sh "SEE ALSO"
sh(I)