@hackage › simple-cmd

Some simple String wrappers of readProcess, readProcessWithExitCode, rawSystem from the Haskell process library.

import SimpleCmd

cmd_ :: String -> [String] -> IO ()

outputs to stdout. For example

cmd_ "echo" ["Hello"]
cmd_ "git" ["clone", url]

This can shortened to git_ "clone" [url].

cmd :: String -> [String] -> IO String

returns stdout as a String. eg

date <- cmd "date" []

There are also cmdBool, cmdMaybe, cmdList, shell, and others.

Simple pipes are also supported:

pipe_ ("echo",["hello"]) ("grep",["ello"])

pipeBool returns True if both commands succeed.

Other examples:

gitBranch :: IO String
grep_ pat file :: IO Bool
sudo_ c args :: IO ()
timeIO :: IO a -> IO a

See the library documentation for more details.

@hackage / simple-cmd