shellwords: Parse strings into words, like a shell would

[ library, mit, text ] [ Propose Tags ]


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Dependencies base (>=4.7 && <5), megaparsec, text [details]
License MIT
Copyright 2018 Patrick Brisbin
Author Patrick Brisbin
Category Text
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Uploaded by PatrickBrisbin at Mon Apr 16 15:56:07 UTC 2018
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Status Docs available [build log]
Last success reported on 2018-04-16 [all 1 reports]
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Readme for shellwords-

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Parse a string into words, like a shell would.


If you need to execute commands given to you as user-input, you should know not to give that text as-is to a shell:

callProcess "sh" ["-c", "some --user --input"]

Such code is a severe security vulnerability. Furthermore, any attempts to sanitize the string are unlikely to be 100% affective and should be avoided. The only safe way to do this is to not use a shell intermediary, and always exec a process directly:

callProcess "some" ["--user", "--input"]

The new problem (and not a security-related one) is how to correctly parse a string like "some --user --input" into the command and its arguments. The rules are complex enough that you probably want to get a library to do it.

So here we are.


Right (cmd:args) <- parse "some -complex --command=\"Line And\" 'More'"

callProcess cmd args
-- Is equivalent to:
-- > callProcess "some" ["-complex", "--command=Line And", "More"]


This package is inspired by and named after