CentOS 8默認安裝時候，如果選成英文，看檔案的時候有可能會費勁，
有的時候需要man或者help的時候，看中文檔案來的快，
locale命令
[root@C8-3 ~]# locale --help
[root@C8-3 ~]# locale --help
Usage: locale [OPTION...] NAME
or: locale [OPTION...] [-a|-m]
Get locale-specific information.
System information:
-a, --all-locales Write names of available locales
-m, --charmaps Write names of available charmaps
Modify output format:
-c, --category-name Write names of selected categories
-k, --keyword-name Write names of selected keywords
-v, --verbose Print more information
-?, --help Give this help list
--usage Give a short usage message
-V, --version Print program version
For bug reporting instructions, please see:
<http://www.gnu.org/software/libc/bugs.html>.
locale命令實際顯示的是/etc/locale.conf中設定的內容
[root@C8-3 ~]# cat /etc/locale.conf
LANG=en_US.utf8
[root@C8-3 ~]# . /etc/locale.conf
[root@C8-3 ~]# locale
LANG=en_US.utf8
LC_CTYPE="en_US.utf8"
LC_NUMERIC="en_US.utf8"
LC_TIME="en_US.utf8"
LC_COLLATE="en_US.utf8"
LC_MONETARY="en_US.utf8"
LC_MESSAGES="en_US.utf8"
LC_PAPER="en_US.utf8"
LC_NAME="en_US.utf8"
LC_ADDRESS="en_US.utf8"
LC_TELEPHONE="en_US.utf8"
LC_MEASUREMENT="en_US.utf8"
LC_IDENTIFICATION="en_US.utf8"
LC_ALL=
查看系統中已有支持的語言
[root@C8-3 ~]# locale -a
C
C.utf8
en_AG
en_AU
en_AU.utf8
en_BW
en_BW.utf8
en_CA
en_CA.utf8
en_DK
en_DK.utf8
en_GB
en_GB.iso885915
en_GB.utf8
en_HK
en_HK.utf8
en_IE
en_IE@euro
en_IE.utf8
en_IL
en_IN
en_NG
en_NZ
en_NZ.utf8
en_PH
en_PH.utf8
en_SC.utf8
en_SG
en_SG.utf8
en_US
en_US.iso885915
en_US.utf8
en_ZA
en_ZA.utf8
en_ZM
en_ZW
en_ZW.utf8
POSIX
發現沒有中文
安裝中文語言支持擴展包
[root@C8-3 ~]# yum -y install langpacks-zh_CN
Repository AppStream is listed more than once in the configuration
Repository extras is listed more than once in the configuration
Repository PowerTools is listed more than once in the configuration
Repository centosplus is listed more than once in the configuration
Last metadata expiration check: -1 day, 11:03:52 ago on Thu Nov 5 14:36:43 2020.
Dependencies resolved.
===============================================================================
Package Architecture Version Repository Size
===============================================================================
Installing:
langpacks-zh_CN noarch 1.0-12.el8 AppStream 9.6 k
Installing weak dependencies:
glibc-langpack-zh x86_64 2.28-101.el8 base 2.1 M
Transaction Summary
===============================================================================
Install 2 Packages
Total download size: 2.2 M
Installed size: 15 M
Downloading Packages:
(1/2): langpacks-zh_CN-1.0-12.el8.noarch.rpm 1.1 kB/s | 9.6 kB 00:08
(2/2): glibc-langpack-zh-2.28-101.el8.x86_64.r 175 kB/s | 2.1 MB 00:12
-------------------------------------------------------------------------------
Total 176 kB/s | 2.2 MB 00:12
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Installing : glibc-langpack-zh-2.28-101.el8.x86_64 1/2
Installing : langpacks-zh_CN-1.0-12.el8.noarch 2/2
Running scriptlet: langpacks-zh_CN-1.0-12.el8.noarch 2/2
Verifying : langpacks-zh_CN-1.0-12.el8.noarch 1/2
Verifying : glibc-langpack-zh-2.28-101.el8.x86_64 2/2
Installed:
langpacks-zh_CN-1.0-12.el8.noarch glibc-langpack-zh-2.28-101.el8.x86_64
Complete!
再次查看，發現有中文了
[root@C8-3 ~]# locale -a
C
C.utf8
en_AG
en_AU
en_AU.utf8
en_BW
en_BW.utf8
en_CA
en_CA.utf8
en_DK
en_DK.utf8
en_GB
en_GB.iso885915
en_GB.utf8
en_HK
en_HK.utf8
en_IE
en_IE@euro
en_IE.utf8
en_IL
en_IN
en_NG
en_NZ
en_NZ.utf8
en_PH
en_PH.utf8
en_SC.utf8
en_SG
en_SG.utf8
en_US
en_US.iso885915
en_US.utf8
en_ZA
en_ZA.utf8
en_ZM
en_ZW
en_ZW.utf8
POSIX
zh_CN
zh_CN.gb18030
zh_CN.gbk
zh_CN.utf8
zh_HK
zh_HK.utf8
zh_SG
zh_SG.gbk
zh_SG.utf8
zh_TW
zh_TW.euctw
zh_TW.utf8
使用localectl命令設定系統語言為中文
查看localectl是否存在
[root@C8-3 ~]# type localectl
localectl is hashed (/usr/bin/localectl)
輸入localectl命令并用tab鍵補全，查看可以跟的引數
[root@C8-3 ~]# localectl
list-keymaps list-x11-keymap-options set-x11-keymap
list-locales list-x11-keymap-variants status
list-x11-keymap-layouts set-keymap
list-x11-keymap-models set-locale
選擇set-locale引數 ，tab補全 ,使用LANG=引數查看當前系統支持的語言，相當于locale -a，
[root@C8-3 ~]# localectl set-locale LANG=
C.utf8 en_GB.utf8 en_PH.utf8 zh_CN
en_AG en_HK en_SC.utf8 zh_CN.gb18030
en_AU en_HK.utf8 en_SG zh_CN.gbk
en_AU.utf8 en_IE en_SG.utf8 zh_CN.utf8
en_BW en_IE@euro en_US zh_HK
en_BW.utf8 en_IE.utf8 en_US.iso885915 zh_HK.utf8
en_CA en_IL en_US.utf8 zh_SG
en_CA.utf8 en_IN en_ZA zh_SG.gbk
en_DK en_NG en_ZA.utf8 zh_SG.utf8
en_DK.utf8 en_NZ en_ZM zh_TW
en_GB en_NZ.utf8 en_ZW zh_TW.euctw
en_GB.iso885915 en_PH en_ZW.utf8 zh_TW.utf8
設定系統語言為zh_CN.utf8
[root@C8-3 ~]# localectl set-locale LANG=zh_CN.utf8
查看當前系統語言
[root@C8-3 ~]# locale
LANG=en_US.utf8
LC_CTYPE="en_US.utf8"
LC_NUMERIC="en_US.utf8"
LC_TIME="en_US.utf8"
LC_COLLATE="en_US.utf8"
LC_MONETARY="en_US.utf8"
LC_MESSAGES="en_US.utf8"
LC_PAPER="en_US.utf8"
LC_NAME="en_US.utf8"
LC_ADDRESS="en_US.utf8"
LC_TELEPHONE="en_US.utf8"
LC_MEASUREMENT="en_US.utf8"
LC_IDENTIFICATION="en_US.utf8"
LC_ALL=
發現并沒有生效！
[root@C8-3 ~]# type locale
locale is hashed (/usr/bin/locale)
因為重啟才會重新加載組態檔
不重啟馬上生效的辦法
手動加載組態檔，使組態檔被加載到記憶體中去
[root@C8-3 ~]# . /etc/locale.conf
[root@C8-3 ~]# type locale
locale 已被錄入哈希表 (/usr/bin/locale)
雖然查看幫助使用中文比較方便，但鑒于所有命令都是英文的，我們還是要習慣于看英文的幫助檔案，遇到看不懂的地方再使用此方法修改系統語言，系統語言為全域變數，改完記得再改回去
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