Book Image

Linux Shell Scripting Essentials

By : Sinny Kumari, Khem Raj
Book Image

Linux Shell Scripting Essentials

By: Sinny Kumari, Khem Raj

Overview of this book

Table of Contents (15 chapters)
Linux Shell Scripting Essentials
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Testing expressions with a test


The shell builtin command test can be used to check file types and compare expressions value. The syntax is test EXPRESSION or the test command is also equivalent to [ EXPRESSION ].

It returns the exit code 1 (false) if the EXPRESSION result is 0, and 0 (true) for a non-zero EXPRESSION result.

If no EXPRESSION is provided, the exit status is set to 1 (false).

File checks

Different kinds of checks can be done on the file using the test command; for example, file existence test, directory test, regular file check, symbolic link check, and so on.

The options available to do various checks on a file are explained in the following table:

Option

Description

-e

fileChecks whether the file exists

-f file

The file is a regular fil

-d file

The file exists and is a directory

-h, -L file

The file is a symbolic link

-b file

The file is block special

-c file

The file is character special

-S file

The file is a socket

-p file

The file is a named pipe

-k file

...