[Haskell-cafe] createProcess problem
Vasili I. Galchin
vigalchin at gmail.com
Mon Apr 27 19:00:52 EDT 2009
I am trying to use createProcess. Following is a small fragment. I am trying
to run a program called blastall (a bio-informatics program). It is kind of
like mv/cp/ln on Unix platforms (where the executable examines the program,
i.e. arg, and then provides appropriate behavior/semantics). In the case
of blastall, it alters its behavior based on the -p(program) CLI
argument.WSo in the following it should provide nucleotide behavior ... that
is what the 'n' on the end of blastn means.
main = do
handle <- runProcess
"blastall" -- executable
["-p blastn"] -- CLI args
Nothing -- optional cwd
Nothing -- optional env
Nothing -- optional stdin
Nothing -- optional stdout
Nothing -- optional stderr
When I run this program with ghci, blastall is not a happy camper. It is
complaining about "-p blastn":
[NULL_Caption] ERROR: Program name undefined: " blastn" <<< the space
between the double quote and 'b' is really there!!!
[NULL_Caption] ERROR: Program name undefined: " blastn"
Yet if I run 'blastall -p blastn' from the DOS prompt no errors(I will try
tonight on my Linux machine).
If I try 'blastall -p bozo" from the DOS prompt I get the same two errors as
when I run my test program using ghci.
I feel that it has something to do with double quotes in Haskell ...
probably something obviously silly that I am doing.
Kind regards, Vasili
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Haskell-Cafe