The author refers to "the shell" in his "benchmark" but if he is a Linux user then sh -c 'f 11 access.2020-01-* ... is dash whereas f 11 access.2020-01

The author refers to "the shell" in his "benchmark" but if he is a Linux user then sh -c 'f 11 access.2020-01-* ... is dash whereas f 11 access.2020-01* ... is bash Needless to say, one of these shells is much faster than the other and only one contains the "time" builtin command. https://wiki.ubuntu.com/DashAsBinSh https://wiki.ubuntu.com/DashAsBinSh Then there is the use of perl and its system command in "count". As with seq, why is perl needed. No explanation. Why not just put the entire pipeline into a perl system command.