Bash

Bash (Bourne Again SHell) is the default Unix shell and command language for Linux systems. It is essential for scripting, automation, and command-line system administration.

Installation

Bash comes pre-installed on Ubuntu. To ensure you have the latest updates, run:

apt update
apt install -y bash

Verification

Check your active shell and version:

bash --version

Hello World Example

Create an executable Bash script named hello.sh:

cat << 'EOF' > hello.sh
#!/bin/bash
echo "Hello, Bash!"
EOF

Make the script executable:

chmod +x hello.sh

Run the script:

./hello.sh

Or pass it directly to the interpreter:

bash hello.sh

Official Resources

• Official Website