How do I clear a file in a bash script?
5 Ways to Empty or Delete a Large File Content in Linux
- Empty File Content by Redirecting to Null.
- Empty File Using ‘true’ Command Redirection.
- Empty File Using cat/cp/dd utilities with /dev/null.
- Empty File Using echo Command.
- Empty File Using truncate Command.
Can Bash take arguments?
Write a Bash script so that it receives arguments that are specified when the script is called from the command line. Use this method when a script has to perform a slightly different function depending on the values of the input parameters, also called arguments.
How to write if else in bash script?
The general syntax of a basic if statement is as follows: The if statement is closed with a fi (reverse of if). Pay attention to white space! There must be a space between the opening and closing brackets and the condition you write. Otherwise, the shell will complain of error.
How to use conditional statements in bash scripts?
In this part of the bash beginner series, you will learn how to use conditional statements in your bash scripts to make it behave differently in different scenarios and cases. This way you can build much more efficient bash scripts and you can also implement error checking in your scripts.
When to use elif or else in bash script?
Any code you want to run when an if condition is evaluated to false can be included in an else statement as follows: Now when you run the script as a regular user, you will be reminded that you are not the almighty root user: You can use an elif (else-if) statement whenever you want to test more than one expression (condition) at the same time.
Are there test conditions that you can use with Bash?
There are numerous test conditions that you can use with if statements. Test conditions varies if you are working with numbers, strings, or files. Think of them as logical operators in bash. I have included some of the most popular test conditions in the table below: