Use lc or uc to normalise the strings you want to compare:

if (lc $var1 ne lc $var2) {
    ...
}

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Note by the way that $a and $b are special variables used by sort and should generally not be used for other purposes - even in example code.

True laziness is hard work

In reply to Re: how to nullify case sensitivity by GrandFather
in thread how to nullify case sensitivity by iphone

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