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tiddlers/Draft of '登录Shell与非登录Shell的环境变量加载顺序' by Gezi-lzq.tid

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+created: 20240310100913991
+creator: Gezi-lzq
+draft.of: 登录Shell与非登录Shell的环境变量加载顺序
+draft.title: 登录Shell与非登录Shell的环境变量加载顺序
+modified: 20240310101914995
+modifier: Gezi-lzq
+tags: 脚本tips
+title: Draft of '登录Shell与非登录Shell的环境变量加载顺序' by Gezi-lzq
+type: 
+
+!! 场景：
+
+1. 用户登录系统时首次获得的Shell（登录Shell）
+2. 打开新的终端或在已有的Shell中执行新的Shell命令（非登录Shell）
+3. 通过Crontab或SSH/Ansible执行命令
+
+!! 原理：
+
+登录Shell初始化脚本加载顺序：
+
+* `/etc/profile`
+* `~/.bash_profile`
+* `~/.bashrc`
+* `/etc/bashrc`
+
+非登录Shell初始化脚本加载顺序：
+
+* `~/.bashrc`
+* `/etc/bashrc`
+
+!!注意事项：
+
+当脚本或命令在Crontab、SSH/Ansible中执行时，应确保所需的环境变量已在非登录Shell的初始化脚本中设置。
+
+应避免依赖于登录Shell特有的环境配置，因为这些配置在非登录Shell中可能不可用。
+
+!! 引用参考
+
+GNU Bash手册关于启动文件的章节：https://www.gnu.org/software/bash/manual/bash.html#Startup-Files
+man bash 命令行手册页，特别是 "INVOCATION" 部分，详细描述了Bash Shell的启动过程和读取的文件。
+
+
+<<<
+
+Invoked as an interactive non-login shell
+When an interactive shell that is not a login shell is started, Bash reads and executes commands from ~/.bashrc, if that file exists. This may be inhibited by using the --norc option. The --rcfile file option will force Bash to read and execute commands from file instead of ~/.bashrc.
+
+So, typically, your ~/.bash_profile contains the line
+
+if [ -f ~/.bashrc ]; then . ~/.bashrc; fi
+after (or before) any login-specific initializations.
+
+Invoked non-interactively
+When Bash is started non-interactively, to run a shell script, for example, it looks for the variable BASH_ENV in the environment, expands its value if it appears there, and uses the expanded value as the name of a file to read and execute. Bash behaves as if the following command were executed:
+
+if [ -n "$BASH_ENV" ]; then . "$BASH_ENV"; fi
+but the value of the PATH variable is not used to search for the filename.
+
+As noted above, if a non-interactive shell is invoked with the --login option, Bash attempts to read and execute commands from the login shell startup files.
+>>>

tiddlers/登录Shell与非登录Shell的环境变量加载顺序.tid

@@ -0,0 +1,58 @@
+created: 20240310100913991
+creator: Gezi-lzq
+modified: 20240310101352396
+modifier: Gezi-lzq
+tags: 脚本tips
+title: 登录Shell与非登录Shell的环境变量加载顺序
+type: 
+
+!! 场景：
+
+1. 用户登录系统时首次获得的Shell（登录Shell）
+2. 打开新的终端或在已有的Shell中执行新的Shell命令（非登录Shell）
+3. 通过Crontab或SSH/Ansible执行命令
+
+!! 原理：
+
+登录Shell初始化脚本加载顺序：
+
+* `/etc/profile`
+* `~/.bash_profile`
+* `~/.bashrc`
+* `/etc/bashrc`
+
+非登录Shell初始化脚本加载顺序：
+
+* `~/.bashrc`
+* `/etc/bashrc`
+
+!!注意事项：
+
+当脚本或命令在Crontab、SSH/Ansible中执行时，应确保所需的环境变量已在非登录Shell的初始化脚本中设置。
+
+应避免依赖于登录Shell特有的环境配置，因为这些配置在非登录Shell中可能不可用。
+
+!! 引用参考
+
+GNU Bash手册关于启动文件的章节：https://www.gnu.org/software/bash/manual/bash.html#Startup-Files
+man bash 命令行手册页，特别是 "INVOCATION" 部分，详细描述了Bash Shell的启动过程和读取的文件。
+
+
+<<<
+
+Invoked as an interactive non-login shell
+When an interactive shell that is not a login shell is started, Bash reads and executes commands from ~/.bashrc, if that file exists. This may be inhibited by using the --norc option. The --rcfile file option will force Bash to read and execute commands from file instead of ~/.bashrc.
+
+So, typically, your ~/.bash_profile contains the line
+
+if [ -f ~/.bashrc ]; then . ~/.bashrc; fi
+after (or before) any login-specific initializations.
+
+Invoked non-interactively
+When Bash is started non-interactively, to run a shell script, for example, it looks for the variable BASH_ENV in the environment, expands its value if it appears there, and uses the expanded value as the name of a file to read and execute. Bash behaves as if the following command were executed:
+
+if [ -n "$BASH_ENV" ]; then . "$BASH_ENV"; fi
+but the value of the PATH variable is not used to search for the filename.
+
+As noted above, if a non-interactive shell is invoked with the --login option, Bash attempts to read and execute commands from the login shell startup files.
+>>>