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Re^2: matching the contents of two (2) files

by Roy Johnson (Monsignor)
on Mar 10, 2005 at 21:07 UTC ( #438419=note: print w/replies, xml ) Need Help??

in reply to Re: matching the contents of two (2) files
in thread matching the contents of two (2) files

If you're going to abbreviate, abbreviate :-)
my %hash; @hash{<LAST>} = (); # Death to the undef trick! exists $hash{$_} or print while <FIRST>;

Caution: Contents may have been coded under pressure.

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Re^3: matching the contents of two (2) files
by dragonchild (Archbishop) on Mar 11, 2005 at 02:15 UTC
    Let's see ... that's about 70 characters.
    #234567890#234567890#234567890#234567890 -p BEGIN{@x{+pop}=()}exists$x{$_}||next
    That's 39 characters. You have to run it as so from the command line.
    perl -p -e 'BEGIN{@x{+pop}=()}exists$x{$_}||next' FIRST.txt LAST.txt > + MISSING.txt

    This is really untested code, but it _should_ work. :-)

    Being right, does not endow the right to be rude; politeness costs nothing.
    Being unknowing, is not the same as being stupid.
    Expressing a contrary opinion, whether to the individual or the group, is more often a sign of deeper thought than of cantankerous belligerence.
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