see perlman:perlop and look for the section on Conditional Operator. It's basically an in-place if-then type of construct that evaluates the EXPR $uclc eq 'lc' and returns lc() if the EXPR is true or uc() if the EXPR is false.

In reply to (ichimunki) re x 4: More efficient munging if infile very large (explain particular syntax?) by ichimunki
in thread More efficient munging if infile very large by ybiC

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