| Portability | portable |
|---|---|
| Stability | provisional |
| Maintainer | libraries@haskell.org |
System.Cmd
Description
Executing an external command.
This module provides a simple interface for executing external commands. For a more complex, but more powerful, interface, see the System.Process module.
Documentation
system :: String -> IO ExitCode
Computation system cmd returns the exit code produced when the
operating system runs the shell command cmd.
This computation may fail with
-
PermissionDenied: The process has insufficient privileges to perform the operation. -
ResourceExhausted: Insufficient resources are available to perform the operation. -
UnsupportedOperation: The implementation does not support system calls.
On Windows, system passes the command to the Windows command
interpreter (CMD.EXE or COMMAND.COM), hence Unixy shell tricks
will not work.
rawSystem :: String -> [String] -> IO ExitCode
The computation rawSystem cmd argscmd in such a way that it receives as arguments the args strings
exactly as given, with no funny escaping or shell meta-syntax expansion.
It will therefore behave more portably between operating systems than system.
The return codes and possible failures are the same as for system.