How do you comment a single line in a shell script?

How do you comment a single line in a shell script?

A single-line comment starts with hashtag symbol with no white spaces (#) and lasts till the end of the line. If the comment exceeds one line then put a hashtag on the next line and continue the comment. The shell script is commented out prefixing # character for single-line comment.

What is single line command?

There is a single command line option which determines whether or not the definitions are permanently removed: Entering the unalias without an argument removes aliases from the shell’s alias list. The built-in shell unalias command doesn’t start a new shell process. The built-in shell unalias command is the default.

How do you run a simple script?

Steps to write and execute a script

1. Open the terminal. Go to the directory where you want to create your script.
2. Create a file with . sh extension.
3. Write the script in the file using an editor.
4. Make the script executable with command chmod +x .
5. Run the script using ./.

Why do you need to write scripts in command line?

A really powerful thing about the command line is that you can write scripts. Scripts let you save commands to run them and also lets you put multiple commands together. Though writing scripts may require an additional time investment initially, this can save you time as you run them repeatedly.

How to write a single line shell script?

You still need a then, and a fi, and enough semicolons. The replacement of back-quotes `…` with $ (…) is just a general good idea, not crucial to this discussion. And now the white space (including newlines) can be replaced by single spaces on a single line.

How to write Bash IF / ELSE statements in one line?

In the first example, we will write a Bash script that will compare two strings in one line. To achieve this functionality, write the Bash script shown in the image below in a Bash file: We will compare two pre-defined strings in the “if” part of the statement, and a message will be displayed if this part is executed.

Can you put the 3rd Line on the same line as the first line?

Suppose I have a 3-line program where the first line is a def, the 2nd line is a for loop declaration, and the 3rd line is a normal statement. You can put the 3rd line on the same line as the 2nd line, but even though this is now technically “one line” below the first colon, you can’t put this new line on the same line as the first line.