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compare what is in ARGV[0] to a file

by dallok (Initiate)
on Nov 01, 2000 at 02:12 UTC ( #39338=categorized question: print w/replies, xml ) Need Help??
Contributed by dallok on Nov 01, 2000 at 02:12 UTC
Q&A  > strings


Description:

I want to compare what is in $ARGV[0] an array that I created from a file that contains single line entries.

This is what I have so far: 
#!c:\perl\bin -w

use strict;

open downfile, '>f:\scripts\text\nodedown.txt':
 print downfile "$ARGV[1] $ARGV[2] is Down on $ARGV[0].\n";
close downfile;

my $routers="F:/scripts/text/routers.txt";

open routers, $routers or die "cannot open $routers: $!\n";
my @lines = <routers>;
close routers;

my ($zero_arg, $first_arg, $sec_arg) = @ARGV[0..2];

if (grep {$zero_arg eq $ARGV[0]} @lines) {
    system('f:\usr\ov\bin\nvecho.exe GOT IT');
}

exit 0;

[download]
Is there a better way to do this?

Answer: compare what is in ARGV0 to a file
contributed by Fastolfe

Be aware that each element in @lines will have the trailing newline from the file. You probably want to chomp(@lines); before you compare it against anything.

In addition, your grep statement is non-sensical. See the documentation for it. If you want to loop through @lines and compare it against $ARGV[0] (why not $zero_arg?), you'll have to either explicitely set up a loop to do it, or modify your grep statement to compare against $_, which will iteratively contain each element in @lines in turn.

Answer: compare what is in ARGV0 to a file
contributed by Ovid

dallok: this appears to be at least the third time that you have asked a variation of this question. I think you would be better served posting this to the Seekers of Perl Wisdom section. Then, rather than post it three times (with little to no explanation), you could generate a running commentary where people ask "What are you talking about?" and you get a chance to clarify it, rather than repeatedly posting "non-questions" like the one above.

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