System.Cmd.rawSystem provides more portable interface than
System.Cmd.system. The behaviour of System.Cmd.system depends on the
installed system shell. rawSystem directly creates a new process
without interaction with the shell. System.Process module provides
even more advanced API.
Cheers,
Krasimir
2006/7/4, Duncan Coutts <[EMAIL PROTECTED]>:
On Tue, 2006-07-04 at 11:22 +0200, J. E. Palomar wrote:
> Hi,
>
> I am newbie in Haskell programing and need to launch
> a shell command through a Haskell code.
> In other programing languages like C or Java I know how
> carry out this task; for instance the code
>
> system("ls -l ")
>
> in C or
>
> exec("ls -l")
>
> in Java work fine and lists the working directory.
> I know that in interactive mode the Haskell command
> :! ls -l
> is similar, but ¿It is possible something like in Haskell
> non-interactive mode?
The function you're looking for is called 'system' and is in the System
module.
System.system :: String -> IO ExitCode
it does just the same as the C and Java versions.
BTW, one way you could have found this out is to search using hoogle:
http://haskell.org/hoogle/
searching for 'system' gives the one we want as part of the search
results
http://haskell.org/hoogle/?q=system
and links to the detailed documentation:
http://haskell.org/ghc/docs/latest/html/libraries/base/System-Cmd.html#v
%3Asystem
Duncan
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