Bug in ghc-502 with system "cmd > tmp"?

[Reuben Thomas]

> I have the following problem on Windows NT using ghc 5.02 from a cygwin
> bash-shell. Calls to System.system of the form
>
>    system $ "grep -E "  ++ show str ++ " " ++ file ++ " > tmp"
>
> do not work because of the ">" (ditto with "<"). Execution yields:
>
>    grep: >: No such file or directory

This is because GHC uses Windows's system(), which always uses cmd.exe (or 
command.com) to execute the command line (it doesn't check the setting of 
SHELL). Perhaps the Hugs one adds that functionality back in. You need to 
use

system $ "[ba]sh -c grep -E " ...

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