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Re^2: How to read the input directory from command line arguments using perl?

by finddata (Sexton)
on Mar 23, 2017 at 04:38 UTC ( #1185539=note: print w/replies, xml ) Need Help??


in reply to Re: How to read the input directory from command line arguments using perl?
in thread How to read the input directory from command line arguments using perl?

Why while is empty without considering and input file?
  • Comment on Re^2: How to read the input directory from command line arguments using perl?

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Re^3: How to read the input directory from command line arguments using perl?
by karlgoethebier (Monsignor) on Mar 23, 2017 at 09:18 UTC
    "...while is empty..."

    It isn't ;-) From "Learning Perl":

    "Another way to read input is with the diamond operator: <>. This is useful for making programs that work like standard Unix utilities, with respect to the invocation arguments (which we'll see in a moment). If you want to make a Perl program that can be used like the utilities cat, sed, awk, sort, grep, lpr, and many others, the diamond operator will be your friend. If you want to make anything else, the diamond operator probably won't help."

    diamond.pl

    #!/usr/bin/env perl while (<>) {print}

    data.txt

    foo bar nose cuke

    Run it: ./diamond.pl data.txt

    Regards, Karl

    «The Crux of the Biscuit is the Apostrophe»

    Furthermore I consider that Donald Trump must be impeached as soon as possible

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