count of man pages by section

man-section-count.sh

#!/bin/sh

# apropos .                                             - whatis database
# sed 's/\s*\(.*\)-.*/\1/'                              - remove content to the right of '-'
# sed -e $'s/,/\\\n/g'                                  - split likes on ','
# grep \(.*\)                                           - remove lines without a section
# sed 's/[^)]*(\([^)]*\)).*/\1/'                        - extract the section string
# awk '{arr[$1]++}END{for (a in arr) print a, arr[a]}'  - get count of each section ($1)
# sort -nrk2                                            - sort by number in reverse order on column 2
# column -t                                             - format in readable columns

apropos . | sed 's/\s*\(.*\)-.*/\1/' | sed -e $'s/,/\\\n/g' | grep \(.*\) | sed 's/[^)]*(\([^)]*\)).*/\1/' | awk '{arr[$1]++}END{for (a in arr) print a, arr[a]}' | sort -nrk2 | head -n 25 | column -t