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Most of the "most used commands" approaches does not consider pipes and other complexities.
This approach considers pipes, process substitution by backticks or $() and multiple commands separated by ;
Perl regular expression breaks up each line using | or < ( or ; or ` or $( and picks the first word (excluding "do" in case of for loops)
note: if you are using lots of perl one-liners, the perl commands will be counted as well in this approach, since semicolon is used as a separator
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