[cs631apue] Read piped files using getopt or argv?

[Tejas Nadkarni]

I'm trying to figure out how to read in the piped files with getopt/argv.

i.e. ./aed -e -p secret <input

How do I read in the input? I tried using argv[optind] or even argv[argc]
and I get null.

Any tips on how to read this in? It works fine if you enter text at the
command line but I can't get the piped files to work. Output seems to work,
just need help with the input.

Thanks for help
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