Catch undefined commands / functions

[functicons]

For new checks and feature suggestions

• [x] https://www.shellcheck.net/ (i.e. the latest commit) currently gives no useful warnings about this
• [x] I searched through https://github.com/koalaman/shellcheck/issues and didn't find anything related

Is it possible to generate warning for undefined command / function? The use case is to catch typos. In practice, I'm okay to maintain a dictionary of command / function names.

Here's a snippet or screenshot that shows the problem:

#!/bin/bash

echa "hello world"

Here's what shellcheck currently says:

No issues detected!

Here's what I wanted or expected to see:

Unknown command "echa"

[brother]

maybe a sounds like match to catch common misspellings or such. it's hard to know what binaries are installed in the PATH of the system and so on.

[christophgil]

Shellcheck is extremly helpful. Thanks for this!

I would highly vote for - Indicating misspelled functions/shell commands.

However, searching executable paths may be time consuming. Furthermore, it will also yield false positives when the dev-environment is not the target machine.

Therefore I think that searching for misspelled commands/functions should not be the default. It should be activated by a command line option.

Many Thanks!