Somebody explain this please!

Through the course of my program, I need to use RCS to check out a file. Read it, modify the contents, write the changes back out, and check the file back in.
Everything works except for checking it back in with 'ci', which tries to be interactive.
From my shell I found that if I do input redirection via "< /dev/null", everything works and I'm not prompted. Yet when I replicate this in my code: 
my $ci = "/usr/bin/ci";
system( "$ci", "-u", "-zLT", "$file", "< /dev/null" );

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I get a prompt (from the interactive part) and then the following error after skipping the interactive part
ci: < /dev/RCS/null: No such file or directory

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Can anybody shed some light?

In reply to Input redirection by spaz

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