|WC(1P)||POSIX Programmer's Manual||WC(1P)|
wc [-c|-m] [-lw] [file...]
The utility also shall write a total count for all named files, if more than one input file is specified.
The wc utility shall consider a word to be a non-zero-length string of characters delimited by white space.
The following options shall be supported:
- Write to the standard output the number of bytes in each input file.
- Write to the standard output the number of <newline> characters in each input file.
- Write to the standard output the number of characters in each input file.
- Write to the standard output the number of words in each input file.
When any option is specified, wc shall report only the information requested by the specified options.
- A pathname of an input file. If no file operands are specified, the standard input shall be used.
- Provide a default value for the internationalization variables that are unset or null. (See the Base Definitions volume of POSIX.1‐2017, Section 8.2, Internationalization Variables for the precedence of internationalization variables used to determine the values of locale categories.)
- If set to a non-empty string value, override the values of all the other internationalization variables.
- Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as opposed to multi-byte characters in arguments and input files) and which characters are defined as white-space characters.
Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard error and informative messages written to standard output.
- Determine the location of message catalogs for the processing of LC_MESSAGES.
"%d %d %d %s\n", <newlines>, <words>, <bytes>, <file>
If the -m option is specified, the number of characters shall replace the <bytes> field in this format.
If any options are specified and the -l option is not specified, the number of <newline> characters shall not be written.
If any options are specified and the -w option is not specified, the number of words shall not be written.
If any options are specified and neither -c nor -m is specified, the number of bytes or characters shall not be written.
If no input file operands are specified, no name shall be written and no <blank> characters preceding the pathname shall be written.
If more than one input file operand is specified, an additional line shall be written, of the same format as the other lines, except that the word total (in the POSIX locale) shall be written instead of a pathname and the total of each column shall be written as appropriate. Such an additional line, if any, is written at the end of the output.
- Successful completion.
- An error occurred.
The following sections are informative.
which produces possibly ambiguous and unparsable results for very large files, as it assumes no number shall exceed six digits.
Some historical implementations use only <space>, <tab>, and <newline> as word separators. The equivalent of the ISO C standard isspace() function is more appropriate.
The -c option stands for ``character'' count, even though it counts bytes. This stems from the sometimes erroneous historical view that bytes and characters are the same size. Due to international requirements, the -m option (reminiscent of ``multi-byte'') was added to obtain actual character counts.
Early proposals only specified the results when input files were text files. The current specification more closely matches historical practice. (Bytes, words, and <newline> characters are counted separately and the results are written when an end-of-file is detected.)
Historical implementations of the wc utility only accepted one argument to specify the options -c, -l, and -w. Some of them also had multiple occurrences of an option cause the corresponding count to be written multiple times and had the order of specification of the options affect the order of the fields on output, but did not document either of these. Because common usage either specifies no options or only one option, and because none of this was documented, the changes required by this volume of POSIX.1‐2017 should not break many historical applications (and do not break any historical conforming applications).
The Base Definitions volume of POSIX.1‐2017, Chapter 8, Environment Variables, Section 12.2, Utility Syntax Guidelines
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|2017||IEEE/The Open Group|