How do I execute a bash script in Terminal?

To execute a Bash script in the terminal, follow these steps:

1. Create the Script File

First, you need a Bash script file. Open your text editor and write your script. For example, consider the following simple script:

bash
#!/bin/bash
echo "Hello, world!"

2. Save the Script

Save the above script as a file, typically with the .sh extension. For example, save it as hello.sh.

3. Add Execution Permissions to the Script File

In the terminal, ensure the script file is executable. Use the chmod command to add execution permissions:

bash
chmod +x hello.sh

4. Execute the Script

Now that the script is executable, you can run it as follows:

bash
./hello.sh

This will output:

shell
Hello, world!

Example Explanation

In this example, you first create a Bash script named hello.sh that prints "Hello, world!". By using the chmod +x hello.sh command, you add execution permissions to the script, allowing it to be executed directly. Finally, by running ./hello.sh, the terminal outputs the script's content.

This method applies to any Bash script, regardless of its complexity; the execution steps are similar.