How Can I Execute Linux Built-in Commands from Go?

Executing Built-In Linux Commands from Go

When attempting to determine the presence of a program on Linux using the exec.Command("command", "-v", "foo") syntax, you may encounter an error stating that "command" was not found in the $PATH. This is because "command" is an intrinsic Linux Shell built-in, not an executable binary.

To execute built-in commands from Go, you have a few options:

1. Using exec.LookPath:

As suggested in the provided article, you can use the exec.LookPath function to search the $PATH for the command you need to execute.

path, err := exec.LookPath("command")
if err != nil {
    // Handle error
}
// Use path to execute the command

2. Using External Shell Invocation:

Alternatively, you can invoke the command from within a shell using the following syntax:

exec.Command("/bin/bash", "-c", "command -v foo")

This will execute the "command" built-in within the Bash shell.

3. Using Shell Execution:

If you need to execute multiple commands or perform more complex operations, you can use the os/exec.Command function to execute a shell script:

cmd := exec.Command("sh", "my-script.sh")
cmd.Run()

This will execute the contents of my-script.sh in the current shell.

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