Shelly provides convenient systems programming in Haskell, similar in spirit to POSIX shells. Shelly:
is aimed at convenience and getting things done rather than being a demonstration of elegance.
has detailed and useful error messages
maintains its own environment, making it thread-safe.
is modern, using Text and system-filepath/system-fileio
Shelly is originally forked from the Shellish package.
See the shelly-extra package for additional functionality.
An overview is available in the README: https://github.com/yesodweb/Shelly.hs/blob/master/README.md