CODEWITHSUNDEEP
perl
Alex Caseiro
Alex Caseiro

Reputation: 423

perl: how to pass more than one value to a system command?

in dos, i would run the following command

simread31 file.sim

and the program would ask me for 9 inputs.

Now, i'd like to do it in perl. I know i can combine echo with system in order for one input, but how to do it for more than one?

many thanks

Upvotes: 0

Views: 120

Answers (1)

tjd
tjd

Reputation: 4104

The reason you're having trouble doing this with system() is that it's the wrong tool for the job. If you open(my $fh, '|-', 'simread31', 'file.sim') you'll be able to print or say your input to the child program's STDIN.

I'm not at my machine right now so that syntax is from memory. perldoc perlopen should provide more detail.

Windows

As Windows does not implement the list form of the piped open, you should use something like this: open(my $fh, '|-', "simread3.exe $sim_file")

Piping input directly from Perl will often be more efficient than opening, writing, closing, piping via system(), and then cleaning up an external file.

Upvotes: 3

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