apropos - phpMan

APROPOS(1) Manual pager utils APROPOS(1)

NAME
apropos - search the manual page names and descriptions

SYNOPSIS
apropos [-dalv?V] [-e|-w|-r] [-s list] [-m system[,...]] [-M path] [-L locale] [-C file]
keyword ...

DESCRIPTION
Each manual page has a short description available within it. apropos searches the de-
scriptions for instances of keyword.

keyword is usually a regular expression, as if (-r) was used, or may contain wildcards
(-w), or match the exact keyword (-e). Using these options, it may be necessary to quote
the keyword or escape (\) the special characters to stop the shell from interpreting them.

The standard matching rules allow matches to be made against the page name and word bound-
aries in the description.

The database searched by apropos is updated by the mandb program. Depending on your in-
stallation, this may be run by a periodic cron job, or may need to be run manually after
new manual pages have been installed.

OPTIONS
-d, --debug
Print debugging information.

-v, --verbose
Print verbose warning messages.

-r, --regex
Interpret each keyword as a regular expression. This is the default behaviour.
Each keyword will be matched against the page names and the descriptions indepen-
dently. It can match any part of either. The match is not limited to word bound-
aries.

-w, --wildcard
Interpret each keyword as a pattern containing shell style wildcards. Each keyword
will be matched against the page names and the descriptions independently. If
--exact is also used, a match will only be found if an expanded keyword matches an
entire description or page name. Otherwise the keyword is also allowed to match on
word boundaries in the description.

-e, --exact
Each keyword will be exactly matched against the page names and the descriptions.

-a, --and
Only display items that match all the supplied keywords. The default is to display
items that match any keyword.

-l, --long
Do not trim output to the terminal width. Normally, output will be truncated to
the terminal width to avoid ugly results from poorly-written NAME sections.

-s list, --sections=list, --section=list
Search only the given manual sections. list is a colon- or comma-separated list of
sections. If an entry in list is a simple section, for example "3", then the dis-
played list of descriptions will include pages in sections "3", "3perl", "3x", and
so on; while if an entry in list has an extension, for example "3perl", then the
list will only include pages in that exact part of the manual section.

-m system[,...], --systems=system[,...]
If this system has access to other operating systems' manual page descriptions,
they can be searched using this option. To search NewOS's manual page descrip-
tions, use the option -m NewOS.

The system specified can be a combination of comma-delimited operating system
names. To include a search of the native operating system's whatis descriptions,
include the system name man in the argument string. This option will override the
$SYSTEM environment variable.

-M path, --manpath=path
Specify an alternate set of colon-delimited manual page hierarchies to search. By
default, apropos uses the $MANPATH environment variable, unless it is empty or un-
set, in which case it will determine an appropriate manpath based on your $PATH en-
vironment variable. This option overrides the contents of $MANPATH.

-L locale, --locale=locale
apropos will normally determine your current locale by a call to the C function
setlocale(3) which interrogates various environment variables, possibly including
$LC_MESSAGES and $LANG. To temporarily override the determined value, use this op-
tion to supply a locale string directly to apropos. Note that it will not take ef-
fect until the search for pages actually begins. Output such as the help message
will always be displayed in the initially determined locale.

-C file, --config-file=file
Use this user configuration file rather than the default of ~/.manpath.

-?, --help
Print a help message and exit.

--usage
Print a short usage message and exit.

-V, --version
Display version information.

EXIT STATUS
0 Successful program execution.

1 Usage, syntax or configuration file error.

2 Operational error.

16 Nothing was found that matched the criteria specified.

ENVIRONMENT
SYSTEM If $SYSTEM is set, it will have the same effect as if it had been specified as the
argument to the -m option.

MANPATH
If $MANPATH is set, its value is interpreted as the colon-delimited manual page hi-
erarchy search path to use.

See the SEARCH PATH section of manpath(5) for the default behaviour and details of
how this environment variable is handled.

MANWIDTH
If $MANWIDTH is set, its value is used as the terminal width (see the --long op-
tion). If it is not set, the terminal width will be calculated using the value of
$COLUMNS, and ioctl(2) if available, or falling back to 80 characters if all else
fails.

POSIXLY_CORRECT
If $POSIXLY_CORRECT is set, even to a null value, the default apropos search will
be as an extended regex (-r). Nowadays, this is the default behaviour anyway.

FILES
/usr/share/man/index.(bt|db|dir|pag)
A traditional global index database cache.

/var/cache/man/index.(bt|db|dir|pag)
An FHS compliant global index database cache.

/usr/share/man/.../whatis
A traditional whatis text database.