Wc

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wc is a program that can count (and print) the number of newline (lines), words and byte counts for files (including stdin).

Example - using wc to count the number of words in a file:

$ wc -w gutenberg/1342-0.txt
124592 gutenberg/1342-0.txt

Example - using wc to count the number of lines in a file:

$ wc -l gutenberg/1342-0.txt
13427 gutenberg/1342-0.txt