wc

Count lines, words, or bytes. More information: https://ss64.com/osx/wc.html.

Count lines in file:

wc -l {{path/to/file}}

Count words in file:

wc -w {{path/to/file}}

Count characters (bytes) in file:

wc -c {{path/to/file}}

Count characters in file (taking multi-byte character sets into account):

wc -m {{path/to/file}}

Use stdin to count lines, words and characters (bytes) in that order:

{{find .}} | wc