in reply to Running 2 scripts at once

    system("echo "$in" >> chatlog.txt);

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You double quotes are not balanced. Moreover, if you want to use redirection, you cannot use the LIST variant of system.
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In Section Seekers of Perl Wisdom