Each manual page has a short description available within it. whatis searches the manual page names and displays the manual page descriptions of any name matched.
name may contain wildcards (-w) or be a regular expression (-r). Using these options, it may be necessary to quote the name or escape (\) the special characters to stop the shell from interpreting them.
Index databases are used during the search and are updated by the mandb program. Depending on your installation, this may be run by a periodic cron job or may be run manually after new manual pages have been installed. To produce an old style text whatis database from the relative index database, issue the below command:
whatis -M manpath -w '*' | sort > manpath/whatis
...where manpath is a manual page hierarchy such as /usr/man.
Interpret each name as a regular expression. If a name matches any part of a page name, a match will be made. This option causes whatis to be somewhat slower due to the nature of database searches.
-w, --wildcard
Interpret each name as a pattern containing shell style wildcards. For a match to be made, an expanded name must match the entire page name. This option causes whatis to be somewhat slower due to the nature of database searches.
-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.
-slist, --sectionslist, --sectionlist
Search only the given manual sections. The list is a colon- or comma-separated list of sections. If an entry in list is a simple section, for example "3", then the displayed 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.
-msystem[,...], --systems=system[,...]
If this system has access to other operating system's manual page names, they can be accessed using this option. To search NewOS's manual page names, 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 manual page names, include the system name man in the argument string. This option will override the $SYSTEM environment variable.
-Mpath, --manpath=path
Specify an alternate set of colon-delimited manual page hierarchies to search. By default, whatis uses the $MANPATH environment variable, unless it is empty or unset, in which case it will determine an appropriate manpath based on your $PATH environment variable. This option overrides the contents of $MANPATH.
-Llocale, --locale=locale
Whatis will normally determine your current locale by a call to the C function setlocale which interrogates various environment variables, possibly including $LC_MESSAGES and $LANG. To temporarily override the determined value, use this option to supply a locale string directly to whatis. Note that it will not take effect until the search for pages actually begins. Output such as the help message will always be displayed in the initially determined locale.
-Cfile, --config-file=file
Use this user configuration file rather than the default of ~/.manpath.
-h, --help
Print a help 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 hierarchy search path to use.
MANWIDTH
If $MANWIDTH is set, its value is used as the terminal width (see the --long option). If it is not set, the terminal width will be calculated using an ioctl if available, the value of $COLUMNS, or falling back to 80 characters if all else fails.
whatis (顯示簡短的手冊頁描述)
在類似Unix的操作系統上，whatis命令顯示簡短的手冊頁描述。
On Unix-like operating systems, the whatis command displays short manual page descriptions.
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1 whatis 運行系統環境
2 whatis 描述
3 whatis 語法
4 whatis 例子
whatis 運行系統環境
Unix&Linux
whatis 描述
每個手冊頁中都有簡短說明。whatis搜索手冊頁名稱并顯示匹配的任何名稱的手冊頁描述。
名稱可以包含通配符（-w）或為正則表達式（-r）。使用這些選項，可能有必要使用名稱引號或轉義（\）特殊字符以阻止外殼程序解釋它們。
索引數據庫在搜索過程中使用，并由mandb程序更新。根據您的安裝，此操作可以通過定期的cron作業運行，也可以在安裝新的手冊頁后手動運行。要從相對索引數據庫生成舊樣式的文本whatis數據庫，請發出以下命令：
...其中manpath是手動頁面層次結構，例如/ usr / man。
Each manual page has a short description available within it. whatis searches the manual page names and displays the manual page descriptions of any name matched.
name may contain wildcards (-w) or be a regular expression (-r). Using these options, it may be necessary to quote the name or escape (\) the special characters to stop the shell from interpreting them.
Index databases are used during the search and are updated by the mandb program. Depending on your installation, this may be run by a periodic cron job or may be run manually after new manual pages have been installed. To produce an old style text whatis database from the relative index database, issue the below command:
...where manpath is a manual page hierarchy such as /usr/man.
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whatis 語法
whatis [-dlhvV] [-r|-w] [-s list] [-m system[,...]] [-M path] [-L locale] [-C file] name ...選件
指定的系統可以是逗號分隔的操作系統名稱的組合。要包括對本機操作系統的手冊頁名稱的搜索，請在參數字符串中包括系統名稱man。此選項將覆蓋$ SYSTEM環境變量。
退出狀態：
環境
whatis [-dlhvV] [-r|-w] [-s list] [-m system[,...]] [-M path] [-L locale] [-C file] name ...Options
The system specified can be a combination of comma delimited operating system names. To include a search of the native operating system's manual page names, include the system name man in the argument string. This option will override the $SYSTEM environment variable.
Exit Status:
Environment
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whatis 例子
顯示一個什么樣的描述whatis的。
Display a description of what whatis is.
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其他命令行
whereis | write | wc | which | w | who | whoami | whois | wait | wall |