word, line, and byte or character
wc utility reads one or more input
text files and, by default, writes the number of lines, words, and bytes
contained in each input file to the standard output. If more than one input
file is specified, a line of cumulative count(s) for all named files is
output on a separate line following the last file count.
wc considers a word to be a maximal string of
characters delimited by whitespace. Whitespace characters are the set of
characters for which the
isspace(3) function returns true.
The options are as follows:
- The number of bytes in each input file is written to the standard output.
- Use unit suffixes: Byte, Kilobyte, Megabyte, Gigabyte, Terabyte, Petabyte, and Exabyte in order to reduce the number of digits to four or fewer using powers of 2 for sizes (K=1024, M=1048576, etc.).
- The number of lines in each input file is written to the standard output.
- Count characters instead of bytes, and use iswspace(3) instead of isspace(3).
- The number of words in each input file is written to the standard output.
When an option is specified,
reports the information requested by that option. The default action is
equivalent to the flags
-clw having been
If no file names are specified, the standard input is used and a file name is not output. The resulting output is one line of the requested count(s) with the cumulative sum of all files read in via standard input.
By default, the standard output contains a line for each input file of the form:
lines words bytes file_name
The counts for lines, words, and bytes (or characters) are integers separated by spaces.
- The character encoding locale(1). It decides which byte sequences form characters.
If unset or set to "C", "POSIX", or an unsupported
-mhas the same effect as
wc utility exits 0 on success,
and >0 if an error occurs.
wc utility is compliant with the
IEEE Std 1003.1-2008 (“POSIX.1”)
The flag [
-h] is an extension to that
wc utility appeared in
Version 1 AT&T UNIX.