wc - count characters, words, and lines in a file
wc [-clw] file ...
-c Print character count
-l Print line count
-w Print word count
wc file1 file2 # Print all three counts for both files
wc -l file # Print line count only
Wc reads each argument and computes the number of characters, words and
lines it contains. A word is delimited by white space (space, tab, or
line feed). If no flags are present, all three counts are printed.