修改shell语言

# 修改shell语言
## 命令
- 临时修改
将`zh_CN.UTF-8`替换为需要用的语言，常用有：
  - en_US.UTF-8
  - zh_CN GB2312
  - zh_CN.GB18030
  - zh_CN.GBK
  - zh_CN.UTF-8

```shell
export LANG=zh_CN.UTF-8
```
## 永久修改
### CentOS
- 7之前的版本
```
cat /etc/sysconfig/i18n
LANG="zh_CN.UTF-8"
SYSFONT="latarcyrheb-sun16"
```

- 7及以后的版本
```
cat /etc/locale.conf
LANG="en_US.UTF-8"
```

### Raspberry OS
- 通过update-locale命令
```shell
root@pi:~# update-locale --help
Usage: update-locale [OPTIONS] [LANG=locale] [LC_NUMERIC=locale] ...
Options:
   --help              display this message and exit
   --reset             ignore variables defined in the locale file
   --locale-file=FILE  file containing locale variables
                       (Default: /etc/default/locale)
   --no-checks         do not perform sanity checks on locale variables
root@pi:~# update-locale LANG=zh_CN.UTF-8
root@pi:~# cat /etc/default/locale
#  File generated by update-locale
LANG=zh_CN.UTF-8
LC_ALL=en_US.UTF-8
LANGUAGE=en_US.UTF-8
root@pi:~# update-locale LANG=en_US.UTF-8
root@pi:~# cat /etc/default/locale 
#  File generated by update-locale
LANG=en_US.UTF-8
LC_ALL=en_US.UTF-8
LANGUAGE=en_US.UTF-8
```