Running scripts in Bash Scripting - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the command to make a script executable in Bash?

Use chmod +x scriptname.sh to give execute permission to the script.

beginner

How do you run a Bash script located in the current directory?

Run it by typing ./scriptname.sh in the terminal.

beginner

Why do you need ./ before the script name when running it?

Because the current directory is not in the PATH by default, ./ tells the shell to run the script from here.

beginner

What does the first line #!/bin/bash in a script do?

It tells the system to use the Bash shell to run the script. This line is called the shebang.

intermediate

Can you run a script without making it executable? How?

Yes, by running bash scriptname.sh or sh scriptname.sh you can run the script without changing permissions.

What command makes a Bash script executable?

A chmod +x script.sh

B run script.sh

C execute script.sh

D bash +x script.sh

The chmod +x command adds execute permission to the script.

How do you run a script named myscript.sh in the current folder?

A bash ./myscript.sh

B myscript.sh

C ./myscript.sh

D run myscript.sh

You run it with ./myscript.sh because the current directory is not in PATH.

What is the purpose of the shebang line #!/bin/bash?

A To comment the first line

B To name the script

C To make the script executable

D To tell the system which shell to use to run the script

The shebang tells the system to use Bash to run the script.

If you do not want to change permissions, how can you run a script?

A bash script.sh

B ./script.sh

C chmod script.sh

D execute script.sh

Running bash script.sh runs the script without needing execute permission.

Why do you need to type ./ before the script name?

A Because it is part of the script name

B Because current directory is not in PATH by default

C Because it makes the script executable

D Because it is a command to run scripts

The shell does not look in the current folder unless you specify ./.

Explain step-by-step how to prepare and run a Bash script from creating it to executing it.

Think about file creation, permissions, and running commands.

Describe why the current directory is not searched by default when running commands and how to run scripts in the current directory.

Consider how the shell finds commands.