As idle musing, and a way to show off my mastery of shell pipelines, I was wondering what my most-used shell commands are. It’s an easy few commands to pipe.
history | sed 's/^ *//;s/ \+/ /g' | cut -d' ' -f 2 | sort | uniq -c | sort -n | tail -n 20
The outcome is rather expected. I feel validated (by my shell) in my own self-perception!
As for a less cryptic unpicking,
history # get the shell's history, as lines of the form ' <nnn> <command> <arguments>' | sed 's/^ *//; # trim leading spaces s/ \+/ /g' # replace multiple spaces with a single one, for all occurrences | cut -d' ' -f 2 # cut the line at every single space, and retain the second field (the <command>) | sort # sort the output, as needed by uniq | uniq -c # remove duplicates, but retain a count, as line of the form '<count> <string>' | sort -n # sort the output | tail -n 20 # keep the last 20 lines
- Due to the lack of line continuations, this commented command is not functional as is.
- This works with the GNU coreutils on Linux. Other Unices may exhibit slightly different behaviours and/or require the use of
g-prefixes commands (e.g.,
gsed) to use the Coreutils implementation (if installed).