$index++ until @repo[$index] eq $input or $i > $#repo;

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Did you perhaps mean: 
$index++ until $repo[$index] eq $input or $index > $#repo;

[download]

since you don't declare $i anywhere, and I'd have a hard time not getting that to loop forever when I started comparing zero to $#repo :)

Edit: thanks to IRCperson for spotting $repo[$index]

In reply to Re^2: Finding index of an entry in an Array by dwu
in thread Finding index of an entry in an Array by monkfan

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