Shell Count Lines

Pipe them into wc.

To count files in a folder:

# The -l flag counts lines specifically.
ls folder | wc -l

> 1330

Count unique lines in a file

To get counts of sorted repeated lines in a file:

sort FILE.txt | uniq -c

To get the most frequent ones at the top of the command:

sort FILE.txt | uniq -c | sort -bgr