Re: $var | system()

If by "multiline text" you mean feed it input via STDIN, you can explicitly open a pipe using open, e.g.

open my $stream, "| mail -s '123' email\@at.com" or die "pipe fail: $!
+";
print $stream $text; # Or @lines, or $line1, $line2...
close $stream; # Handle needs to close or go out of scope to clear buf
+fer and send EOF
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There are a large number of other possibilities here, depending on how complex you want to get: system; pipe, fork and exec; IPC::Open2; IPC::Open3... See perlipc for some gory detail.

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

In Section Seekers of Perl Wisdom