You could read the output of
who via backticks as one long string with embedded newlines:
my $str = `who`;
To get a hash of it, you'd have to split the string on newlines, then split each line:
foreach my $line (split /\n/,$str) {
my ($user, $remainder) = split /\s/,$_,2;
$hash{$user}++; # just increment the value
}
But you could also use open to read from who:
open(PIPE,"who |") or die "Can't run 'who': $!\n";
while(<PIPE>) {
my ($user, $remainder) = split; # implicit split splits $_ on /\s
++/
$hash{$user}++;
Now you have a populated hash.
# sort by user
foreach my $user(sort keys %hash) {
print "$user logged in $hash{$user} times.\n";
}
# sort by times users are logged in
foreach my $user(sort {$hash{$a} <=> $hash{$b}} keys %hash) {
print "$user logged in $hash{$user} times.\n";
}
--shmem
_($_=" "x(1<<5)."?\n".q·/)Oo. G°\ /
/\_¯/(q /
---------------------------- \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}
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