in reply to How do I compare two strings against two arrays respectively?

grep (or map) in a void context is generally considered bad. Better to store the array in a hash, especially if you access it more than once:
my %file;
@routers{@ARRAY} = undef;
@interfaces{@anotherarray} = undef
if (exists $routers{$zero_arg} and not exists $interfaces{$sec_arg)) {
 #Do stuff
}

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RE: Answer: HOw do I compare two strings against to arrays respectively
by runrig (Abbot) on Nov 04, 2000 at 00:44 UTC
    Re-reading your problem (and if I understand it correctly), I'd do it this way:
    my %file;
@routers{@ARRAY} = undef;
die "Bad zero_arg" unless exists $routers{$zero_arg};
my %interfaces;
@interfaces{@anotherarray} = undef;


unless (exists $interfaces{$sec_arg)) {
 #Do stuff
}
# OR this, if appropriate
return if exists $interfaces{$sec_arg};
#Do stuff

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