How to use the shift command in Linux

This article will explain in detail how to use the shift command in Linux. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

Linux commonly used command shift command is mainly used to move position parameters, the position parameters $n, $n. Rename to $1, $2.

Shift move position parameter.

Summary shift [n] Parameter n (optional): an integer greater than or equal to 1 and less than or equal to the number of parameters, defaults to 1.

The return value returns successful unless n is greater than the number of parameters or n is less than 1 and other illegal values.

The example assumes that our script file (test.sh) is as follows:

#! / usr/bin/env bash # displays the first three positional parameters. Echo "$1 $2 $3" # removes the first two positional parameters and renames $3 to $1, and so on. Shift 2 echo "$1 $2 $3" executes the script on the terminal:

The information returned by sh test.sh q w e r t is as follows:

Q w e e r t note that this command is a bash built-in command. For related help, please see the help command.

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