You might use the function lc to lowercase the whole string (i.e. $input_command) before you split it.
You can read in a file line by line with
$line=<ADDYFILE> or in one single swoop with
@file=<ADDYFILE>.
To go through @file you could use foreach:
foreach my $line ( @file ) {
if ($line=m/^\s*$subname\s*:\s*(\S*)/i) {
do something, we found it
}
}
I'm assuming here that the format of @file looks something like this:
submane1: address1
subname2 : address2
...
and addresses have no spaces in them.
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