Re: using fields in perl

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Re^2: using fields in perl by ysth (Canon) on Dec 25, 2007 at 05:21 UTC
Perhaps better: `perl -lane'print $F[0]' FILE` [download] (I wish it could be -elan.) -- CollegeGear.com - more than just college gear (though, yes, we have college-branded teddy bears)	[reply] [d/l]
Re^3: using fields in perl by jettero (Monsignor) on Dec 25, 2007 at 13:00 UTC
You guys, I'm not sure '-a' is quite equivalent to the awk fields. I'm no good at awk, but I believe it splits on `m/\s+/` rather than `\s`. perlrun says '-a' is this: `while (<>) { @F = split(' '); print pop(@F), "\n"; }` [download] But I think you'd have to `@F = grep {$_} @F` or change the split or something. no? (Also, I think elan should work. I mean, I know it doesn't, but isn't there some posix-y arg processing style where if 'a' and 'b' take arguments "-dacbe aarg barg" still works? Perhaps I imagined that.) UPDATE: oh, jstrom, I did not know that... I assumed split splooged any argument into a regex. -Paul	[reply] [d/l] [select]
Re^4: using fields in perl by JStrom (Pilgrim) on Dec 25, 2007 at 13:57 UTC
From perlfunc's entry on split: As a special case, specifying a PATTERN of space (' ') will split on white space just as split with no arguments does. Thus, split(' ') can be used to emulate awk's default behavior, whereas split(/ /) will give you as many null initial fields as there are leading spaces. A split on /\s+/ is like a split(' ') except that any leading whitespace produces a null first field. A split with no arguments really does a split(' ', $_) internally.	[reply]
Re^5: using fields in perl by demerphq (Chancellor) on Dec 25, 2007 at 20:44 UTC
Re^4: using fields in perl by ysth (Canon) on Dec 25, 2007 at 18:03 UTC
(Also, I think elan should work. I mean, I know it doesn't, but isn't there some posix-y arg processing style where if 'a' and 'b' take arguments "-dacbe aarg barg" still works? Perhaps I imagined that.) If so, perl doesn't use such a style. But perl does allow bundling -l even though it takes an octal argument, so long as the switch after it doesn't look like an octal number. -- CollegeGear.com - more than just college gear (though, yes, we have college-branded teddy bears)	[reply]