man [−k] name...
- Interpret name operands as keywords to be used in searching a utilities summary database that contains a brief purpose entry for each standard utility and write lines from the summary database that match any of the keywords. The keyword search shall produce results that are the equivalent of the output of the following command:
grep −Ei ' name name ... ' summary-database
- A keyword or the name of a standard utility. When −k is not specified and name does not represent one of the standard utilities, the results are unspecified.
- Provide a default value for the internationalization variables that are unset or null. (See the Base Definitions volume of POSIX.1‐2008, 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 in the summary database). The value of LC_CTYPE need not affect the format of the information written about the name operands.
- Determine the location of message catalogs for the processing of LC_MESSAGES.
- Determine an output filtering command for writing the output to a terminal. Any string acceptable as a command_string operand to the sh −c command shall be valid. When standard output is a terminal device, the reference page output shall be piped through the command. If the PAGER variable is null or not set, the command shall be either more or another paginator utility documented in the system documentation.
- Successful completion.
- An error occurred.
- Large quantities of documentation should not be required on a system that does not have excess disk space.
- The current manual system does not present information in a manner that greatly aids user portability.
- A ``better help system'' is currently an area in which vendors feel that they can add value to their POSIX implementations.
man — Display system documentation ps — Report process status