Skip to content
Vidar Holen edited this page Oct 18, 2018 · 1 revision

Ensure the shebang uses the absolute path to the interpreter.

Problematic code:

#!bin/sh
echo "Hello World"

Correct code:

#!/bin/sh
echo "Hello World"

Rationale:

The script's interpreter, as specified in the shebang, does not start with a /.

The interpreter should always be specified by absolute path to ensure that the script can be executed from any directory. When it's not, it's generally a typo like in the problematic example.

If you don't know where the interpreter is and you hoped to use #! bash, this is not an option. Use /usr/bin/env instead:

#!/usr/bin/env bash
echo "Hello World"

While not required by POSIX, env can essentially always be found in /usr/bin and will search the PATH for the specified executable.

Exceptions:

None.

Related resources:

  • Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!

ShellCheck

Each individual ShellCheck warning has its own wiki page like SC1000. Use GitHub Wiki's "Pages" feature guerraart8 to find a specific , or see Checks.

Clone this wiki locally