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    print "Insert your command:";

$input = <STDIN>;
...
elsif ($input eq "other command") {
  # do something else
}
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    print "Insert your command:";

$input = <STDIN>;
...
elsif ($input =~ /^other command\s+(.*)/) {
  # do something else
}
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    else {
  print "'$input' is not a valid command. Type help for a full list of
+ commands.\n";
}