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# echo '1 2 3 ' | awk -F' ' '{print NF}'
3
# echo '1:2:3:' | awk -F':' '{print NF}'
4

I know that the manpath varable /etc/man.config:

# Every automatically generated MANPATH includes these fields
#
MANPATH /usr/man
MANPATH /usr/share/man
MANPATH /usr/local/man
MANPATH...