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Re^2:Need help understanding code snippet with "grep -f"

by fifaltra (Acolyte)
on Dec 23, 2015 at 04:09 UTC ( #1150992=note: print w/replies, xml ) Need Help??


in reply to Re: Need help understanding code snippet with "grep -f"
in thread Need help understanding code snippet with "grep -f"

Well, I did read it, but I couldn't figure out what the -f does there, and how the behaviour of grep described in the docs would give me a list of existing files. But that's probably cleared up now. Is there also documentation on this "-f" thing? Because it's really hard to google for something as short as "-f"...
  • Comment on Re^2:Need help understanding code snippet with "grep -f"

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Re^3: Need help understanding code snippet with "grep -f"
by Anonymous Monk on Dec 23, 2015 at 04:13 UTC
Re^3: Need help understanding code snippet with "grep -f"
by Anonymous Monk on Dec 23, 2015 at 04:23 UTC
Re^3: Need help understanding code snippet with "grep -f"
by GotToBTru (Prior) on Dec 23, 2015 at 20:13 UTC

    Reading this reminded me .. I had the exact same thing trip me up. -f is not a switch to the grep function but rather an independently defined function that just happens to be used as an argument here. But the unix-familiar mind sees that and thinks "grep -f" is a special form of "grep" and seeks the answer in the grep documentation. And doesn't find it.

    Using the block form of grep might have made this clearer.

    @files = grep { -f } glob("~/data/*");
    But God demonstrates His own love toward us, in that while we were yet sinners, Christ died for us. Romans 5:8 (NASB)

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