Linux variables #, @, 0, 1, 2, *, $, $? Linux Variables

Source: Internet
Author: User

Linux variables #, @, 0, 1, 2, *, $, $? Linux Variables
Linux variables #, @, 2, *, $, $

Let's first write a simple script and then explain the meaning of each variable after execution # touch variable # vi variable script content is as follows :#! /Bin/shecho "number :#"

Echo "scname: 0"

Echo "first: 1" echo "second: 2"

Echo "argume: $ @"

Echo "show parm list: $ *"

Echo "show process id: $"

Echo "show precomm stat: $"

Save and exit to grant the script execution permission # chmod + x variable to execute the script #./variable aa bbnumber: 2

Scname:./variable

First: aa

Second: bb

Argume: aa bbshow parm list: aa bb

Show process id: 24544 show precomm stat: 0

The displayed result shows: $ # number of parameters passed to the script $0 is the name of the script itself $1 is the first parameter passed to the shell script $2 is the second parameter passed to the shell script $ @ is a list of all parameters passed to the script $ * shows all parameters passed to the script using a single string, different from location variables, a maximum of nine parameters $ indicates the ID of the current process in which the script runs. $ indicates the exit status of the last command. 0 indicates no error. Others indicate errors.

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.