Test statement format for Linux shell scripts

Source: Internet
Author: User
Tags file size linux

In the shell script to do a variety of tests frequently, test the format of the statement:

(1) Test < test expression >

(2) [< test expression;

(3) [[< test expression "]]

Three kinds of differences, in the third can be a wildcard matching, and &&,| |,<,>, the operator can also be normal presence in [[]], but cannot exist in [].

File test operator

"Inode, save the file's meta information, such as file creator, file modification time, creation time, file size, etc., is the inode, Chinese is the index node, view the Inode method: Stat filename"

String operator and integer two-dollar comparison operator

When it comes to numerical calculation, try to use (()), in (()) to refer to the value of the variable, plus $ or not all can, in (()) Do not use the left and right spaces

Related Article

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.