9.3.24 shift command (shifts the run-time parameters)

Syntax

shift  [n]

Description

This command shifts all the run-time parameters so that a specified subsequent parameter becomes set in the first position.

Argument

n: Specifies the number of places by which the run-time parameters are to be shifted. When this argument is specified, the run-time parameters are shifted by the specified number of places. When this argument is omitted, 1 is assumed (the second parameter becomes the first parameter, and so on). If you specify 0, the run-time parameters are not shifted. If you specify a negative or non-numeric value, the command terminates with an error. If you specify a value greater than the number of run-time parameters, the command terminates with an error.

Return codes

Return code	Meaning
`0`	Normal termination
`1`	Error termination

Notes

If you specify 0 for the argument, the run-time parameters are not shifted. If you intend to use the shift command to iterate through the run-time parameters in a for statement, while statement, or other looping control structure, be sure not to specify 0 for the argument.
If the command syntax of this special built-in command is invalid, it exits the shell that is executing the command.

Example