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                ## 簡介 環境變量是定義操作系統運行環境、保證系統正常運行的一些參數 ## 操作 * `set`、`declare`輸出所有變量,包括全局變量和局部變量 * `env`只顯示全局變量 * `export`顯示和設置環境變量的值 * `echo $變量名`查看某個具體的環境變量 * `unset 變量名`刪除變量 ``` [henry@localhost shell]$ echo $PATH .:/bin:/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/home/oracle/.local/bin:/home/oracle/bin:/home/oracle/bin:/u01/app/oracle/product/19.2.0/db_1/bin:/bin:/usr/bin:/bin:/usr/bin/X11:/usr/local/bin [henry@localhost shell]$ export declare -x CLASSPATH="/u01/app/oracle/product/19.2.0/db_1/JRE:/u01/app/oracle/product/19.2.0/db_1/jlib:/u01/app/oracle/product/19.2.0/db_1/rdbms/jlib:/u01/app/oracle/product/19.2.0/db_1/network/jlib" declare -x DISPLAY="localhost:10.0" declare -x HISTCONTROL="ignoredups" declare -x HISTSIZE="1000" declare -x HOME="/home/henry" declare -x HOSTNAME="localhost.localdomain" ``` ## 配置 1. `export` 當前用戶當前終端立即生效,終端關閉失效 2. `vim ~/.bashrc` 用戶級別環境變量定義文件 當前用戶新開終端或者手動`source ~/.bashrc`后永久生效 3. `vim ~/.bash_profile` 用戶級別環境變量定義文件 當前用戶新開終端或者手動`source ~/.bash_profile`后永久生效 4. `vim /etc/bashrc` 系統級別環境變量定義文件 所有用戶新開終端或者手動`source /etc/bashrc`后永久生效 5. `vim /etc/profile` 系統級別環境變量定義文件 所有用戶新開終端或者手動`source /etc/profile`后永久生效 ## 加載順序 `/etc/profile` -> `~/.bash_profile` -> `~/.bashrc`
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