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GNU finddoes help. But OP works onAIXmachines soGNU findwasn't available to him.lscan't be made to accumulate files before sorting.lsis so fast compared tofind.lsandfindreads the same data, so I can't imagine any reason ls should be considerably faster than find. On my system find is 5 times faster (searching through roughly half a million files)find . -type f -printf "%T@ %Tc %p\n" | sort -n > out.txtyielding output entries like1427913836.2330520210 wed 1 apr 2015 20:43:56 ./subdir/file.txt.