Bash Online Compiler | Free Online Compiler

Script

echo "Hello, Bash!"
if [ -n "$1" ]; then
    echo "First arg: $1"
fi

STDIN (optional)

Args (space separated)

Output

What Is the Bash Online Compiler?

This tool lets you write and run Bash shell scripts directly in your browser without installing anything on your machine. Whether you are learning Bash scripting for the first time or quickly testing a command sequence, this compiler provides instant execution and output.

Bash is the default shell on most Linux distributions and macOS. It is widely used for task automation, system administration, file processing, and writing deployment scripts. This online environment gives you a safe sandbox to experiment with Bash syntax including variables, loops, conditionals, functions, and command-line arguments.

All code executes on a remote sandboxed server powered by the Piston API. Your browser sends the script to the server, which runs it inside an isolated container and returns the output. No local setup is required.

How It Works

Write your Bash script in the editor panel. The editor starts with a simple example that prints a greeting and checks for command-line arguments.
Provide input in the STDIN field if your script reads from standard input using read or similar commands. Leave this empty if your script does not need input.
Add command-line arguments in the Args field. These are accessible in your script as $1, $2, and so on.
Click the Run button to send your script to the Piston execution server. The server runs your Bash script and captures all output from stdout and stderr.
View the results in the Output panel. You will see everything your script prints, including any error messages.

Step-by-Step Example

Suppose you want to write a script that reads a name from standard input and greets the user. Here is how you would do it:

First, type the following code into the editor panel:

#!/bin/bash
echo "What is your name?"
read name
echo "Hello, $name! Welcome to Bash scripting."
echo "Today is $(date +%A)."

Next, go to the STDIN field and type a name, for example Alice. This value will be read by the read command when the script runs.

Now click the Run button. The server executes your script with the provided input. After a moment, the Output panel displays the result:

What is your name?
Hello, Alice! Welcome to Bash scripting.
Today is Wednesday.

Use Cases

Learning Bash scripting fundamentals. Practice variables, loops, conditionals, string manipulation, and arithmetic operations in a zero-setup environment.
Testing shell commands and pipelines. Try out command sequences, pipes, and redirections before using them on a real system.
Practicing for system administration tasks. Write scripts that process text, parse log files, or automate repetitive tasks.
Preparing for technical interviews. Many DevOps and SRE interviews include Bash scripting questions. Practice solutions with immediate feedback.
Prototyping automation scripts. Quickly draft and test scripts for file renaming, data extraction, or batch processing workflows.

Limitations and Notes

Sandboxed environment. The execution environment is isolated. Access to the broader filesystem, network, and system services is restricted.
Limited external commands. Not all Linux utilities are available in the sandbox. Common tools like grep, sed, and awk may be present, but others may not.
No persistent storage. Files created during execution are temporary and discarded after the script finishes.
No network access. Commands like curl, wget, and ssh will not work in this environment.
Execution timeout applies. Scripts that run too long or enter infinite loops are terminated automatically.
Single script execution. You cannot source external scripts or use multiple script files.

Frequently Asked Questions

What Bash version does this compiler use?

It uses the latest available Bash version provided by the Piston execution engine.

Can I run external commands?

External commands are limited to what is available in the sandboxed environment. Common utilities may not be installed.

Do pipes and redirects work?

Yes, basic pipe and redirect support is available, including piping between commands and redirecting output.

Can I use variables and arrays?

Yes, Bash variables, arrays, and associative arrays are fully supported.

Can I define functions?

Yes, you can define and call Bash functions using standard syntax.

Can I perform file operations?

File operations are limited and sandboxed. You can create and read temporary files, but access to the broader filesystem is restricted.

Does this support standard input?

Yes, you can provide input via the STDIN field and your script can read it using read or other input commands.

Do I need a shebang line?

No, a shebang line is not required. Your script is automatically executed with Bash.

Bash Compiler