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APROPOS(1)	       DragonFly General Commands Manual	    APROPOS(1)


apropos, whatis -- search the whatis database


apropos keyword ... whatis keyword ...


apropos searches a set of database files containing short descriptions of system commands for keywords and displays the result on the standard out- put. whatis displays only complete word matches. keyword really is an extended regular expression, please read grep(1) manual page for more information about its format.


The apropos utility exits 0 on success, and 1 if no keyword matched.


grep(1), man(1), makewhatis(8) DragonFly 5.5 January 15, 1991 DragonFly 5.5 APROPOS(1) DragonFly General Commands Manual APROPOS(1)


apropos, whatis -- search manual page databases


apropos [-acfhklw] [-C file] [-M path] [-m path] [-O outkey] [-S arch] [-s section] expression ...


The apropos and whatis utilities query manual page databases generated by makewhatis(8), evaluating expression for each file in each database. By default, they display the names, section numbers, and description lines of all matching manuals. By default, apropos searches for makewhatis(8) databases in the default paths stipulated by man(1) and uses case-insensitive substring matching (the = operator) over manual names and descriptions (the Nm and Nd macro keys). Multiple terms imply pairwise -o. whatis is a synonym for apropos -f. The options are as follows: -a Instead of showing only the title lines, show the complete manual pages, just like man(1) -a would. If the standard output is a terminal device and -c is not specified, use more(1) to paginate them. In -a mode, the options -IKOTW described in the mandoc(1) manual are also available. -C file Specify an alternative configuration file in man.conf(5) format. -c In -a mode, copy the formatted manual pages to the standard out- put without using more(1) to paginate them. -f Search for all words in expression in manual page names only. The search is case insensitive and matches whole words only. In this mode, macro keys, comparison operators, and logical opera- tors are not available. This overrides any earlier -k and -l options. -h Instead of showing the title lines, show the SYNOPSIS sections, just like man(1) -h would. -k Support the full expression syntax. This overrides any earlier -f and -l options. It is the default for apropos. -l An alias for mandoc(1) -a. This overrides any earlier -f, -k, and -w options. -M path Use the colon-separated path instead of the default list of paths searched for makewhatis(8) databases. Invalid paths, or paths without manual databases, are ignored. -m path Prepend the colon-separated paths to the list of paths searched for makewhatis(8) databases. Invalid paths, or paths without manual databases, are ignored. -O outkey Show the values associated with the key outkey instead of the manual descriptions. -S arch Restrict the search to pages for the specified machine(1) archi- tecture. arch is case insensitive. By default, pages for all architectures are shown. -s section Restrict the search to the specified section of the manual. By default, pages from all sections are shown. See man(1) for a listing of sections. -w Instead of showing title lines, show the pathnames of the match- ing manual pages, just like man(1) -w would. An expression consists of search terms joined by logical operators -a (and) and -o (or). The -a operator has precedence over -o and both are evaluated left-to-right. ( expr ) True if the subexpression expr is true. expr1 -a expr2 True if both expr1 and expr2 are true (logical `and'). expr1 [-o] expr2 True if expr1 and/or expr2 evaluate to true (logical `or'). term True if term is satisfied. This has syntax [[key[,key...]](=|~)]val, where key is an mdoc(7) macro to query and val is its value. See Macro Keys for a list of available keys. Operator = evaluates a substring, while ~ evaluates a reg- ular expression. -i term If term is a regular expression, it is evaluated case-insensi- tively. Has no effect on substring terms. Results are sorted by manual sections and names, with output formatted as name[, name...](sec) - description Where ``name'' is the manual's name, ``sec'' is the manual section, and ``description'' is the manual's short description. If an architecture is specified for the manual, it is displayed as name(sec/arch) - description Resulting manuals may be accessed as $ man -s sec name If an architecture is specified in the output, use $ man -s sec -S arch name Macro Keys Queries evaluate over a subset of mdoc(7) macros indexed by makewhatis(8). In addition to the macro keys listed below, the special key any may be used to match any available macro key. Names and description: Nm manual name Nd one-line manual description arch machine architecture (case-insensitive) sec manual section number Sections and cross references: Sh section header (excluding standard sections) Ss subsection header Xr cross reference to another manual page Rs bibliographic reference Semantic markup for command line utilities: Fl command line options (flags) Cm command modifier Ar command argument Ic internal or interactive command Ev environmental variable Pa file system path Semantic markup for function libraries: Lb function library name In include file Ft function return type Fn function name Fa function argument type and name Vt variable type Va variable name Dv defined variable or preprocessor constant Er error constant Ev environmental variable Various semantic markup: An author name Lk hyperlink Mt ``mailto'' hyperlink Cd kernel configuration declaration Ms mathematical symbol Tn tradename Physical markup: Em italic font or underline Sy boldface font Li typewriter font Text production: St reference to a standards document At AT&T UNIX version reference Bx BSD version reference Bsx BSD/OS version reference Nx NetBSD version reference Fx FreeBSD version reference Ox OpenBSD version reference Dx DragonFly version reference


MANPAGER Any non-empty value of the environment variable MANPAGER will be used instead of the standard pagination program, more(1). MANPATH The standard search path used by man(1) may be changed by spec- ifying a path in the MANPATH environment variable. Invalid paths, or paths without manual databases, are ignored. Over- ridden by -M. If MANPATH begins with a colon, it is appended to the default list; if it ends with a colon, it is prepended to the default list; or if it contains two adjacent colons, the standard search path is inserted between the colons. If none of these conditions are met, it overrides the standard search path. PAGER Specifies the pagination program to use when MANPAGER is not defined. If neither PAGER nor MANPAGER is defined, /usr/bin/more -s will be used.


mandoc.db name of the makewhatis(8) keyword database /etc/man.conf default man(1) configuration file


The apropos utility exits 0 on success, and >0 if an error occurs.


Search for ".cf" as a substring of manual names and descriptions: $ apropos .cf Include matches for ".cnf" and ".conf" as well: $ apropos .cf .cnf .conf Search in names and descriptions using a regular expression: $ apropos '~set.?[ug]id' Search for manuals in the library section mentioning both the "optind" and the "optarg" variables: $ apropos -s 3 Va=optind -a Va=optarg Do exactly the same as calling whatis(1) with the argument "ssh": $ apropos -- -i 'Nm~[[:<:]]ssh[[:>:]]' The following two invocations are equivalent: $ apropos -S arch -s section expression $ apropos \( expression \) -a arch~^(arch|any)$ -a sec~^section$


man(1), re_format(7), makewhatis(8)


Part of the functionality of whatis was already provided by the former manwhere utility in 1BSD. The apropos and whatis utilities first appeared in 2BSD. They were rewritten from scratch for OpenBSD 5.6. The -M option and the MANPATH variable first appeared in 4.3BSD; -m in 4.3BSD-Reno; -C in 4.4BSD Lite1; and -S and -s in OpenBSD 4.5 for apropos and in OpenBSD 5.6 for whatis.


Bill Joy wrote manwhere in 1977 and the original BSD apropos and whatis in February 1979. The current version was written by Kristaps Dzonsons <kristaps@bsd.lv> and Ingo Schwarze <schwarze@openbsd.org>. DragonFly 5.5 February 16, 2015 DragonFly 5.5

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