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Re^2: One liner to subtract by 2

by derby (Abbot)
on Jul 24, 2013 at 14:08 UTC ( #1046123=note: print w/replies, xml ) Need Help??


in reply to Re: One liner to subtract by 2
in thread One liner to subtract by 2

You'll lose leading zeros with that.

-derby

update: so perl -pe 's/([0-9]{10})$/sprintf("%010d", $1-2)/e'

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Re^3: One liner to subtract by 2
by choroba (Chancellor) on Jul 24, 2013 at 14:10 UTC
    Thanks, fixed.
    لսႽ ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

      Thanks Guys

      the header is on the first line of my file so I'm doing the following

      perl -pe 's/(0-9{10})$/sprintf("%010d", $1-2)/e if $. ==1' TONYFILE.DAT

      for some reason it's not changing the count...it's still 496

      any idea what i'm missing here?

        This outputs the new contents to the standard output. If you want to change the file, you have to add the -i flag:
        perl -i~ -pe ...
        لսႽ ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

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[Corion]: Maybe doing a double-fork (daemonizing) can make go that information away, but maybe not
[Corion]: But I think my knowledge of unix/Linux datastructures is several decades out of date, so I don't really know what information it keeps on processes
[oiskuu]: The useful bits that relate to your process can be found under /proc/self. What information are you thinking of? Tty name?
[tye]: I just daemonized and getlogin() still knew who I had been.
[tye]: perhaps loginuid ? Not that I concede that something not being in /proc means it is not useful.
[Corion]: tye: That's really interesting, but maybe it is because getlogin() returns the name, or the uid, so if that user has been replaced by another user with the same uid in the meantime, that's no problem to the system...
[davido]: or on ubuntu /var/run/utmp

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