Lazily check for update and cache strlen#87
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Instead of comparing the whole statusstr to the old statusstr (in getstatus), only compare the result of each shell script that is currently called to the old result (in getcmd), and before comparing, check whether the length of the new string is different to the old string, the old length being cached, in which case we can avoid the comparison.
delimLen is made equal to strlen(delim) to avoid confusion.