Beginner's Guide: Configuring Environment Variables in Linux
This article introduces the knowledge of Linux environment variables. Environment variables are information carriers for the system or programs (e.g., PATH records command paths). Their role is to allow programs to be found by the system and to set running parameters. To view environment variables, you can use `printenv`/`env` (for all variables) or `echo $VariableName` (for a single variable). For temporary configuration, use `export VariableName=Value`, which only takes effect in the current terminal session. For permanent configuration, modify the configuration files: for the user-level, edit `~/.bashrc` or `~/.zshrc` (effective for the current user); for the system-level, edit `/etc/profile` (effective for all users). After modification, use `source` to load the changes. Verification can be done by checking the newly added path with `echo $PATH` or testing relevant tools. Common issues include: forgetting to use `source` which leads to configuration not taking effect, path errors, and requiring `sudo` privileges for system-level configurations. In summary: use `export` for temporary settings, modify configuration files for permanence, and mastering environment variables can enhance efficiency.
Read MoreSetting Environment Variables in Linux: A Beginner's Guide
This article introduces the core knowledge of Linux environment variables. Environment variables are variables that store system or program runtime information, such as software paths, language settings, etc. They allow the system to "remember" configurations without repeatedly entering complex information. Setting environment variables is mainly used to enable the system to locate executable programs (such as the PATH variable) or to control language, user information, etc. To view variables: use `echo $VARIABLE_NAME` for a single variable, and `env` or `printenv` for all variables. Temporary settings (valid only in the current terminal) use `export VARIABLE_NAME=value`, for example, `export MY_VAR="hello"`. For permanent settings, there are user-level configurations (modify `~/.bashrc` or `~/.profile` and require `source` to take effect) and system-level configurations (requires `sudo` to modify files like `/etc/profile`, applicable to all users). The `PATH` variable is critical, as it lists the paths the system searches for executable files. To temporarily add a path, use `export PATH=$PATH:/new/path`, and permanent configuration follows the same logic. Common variables also include `HOME` (home directory), `LANG` (language), etc. Note: Use `export` for temporary settings and configuration files for permanent ones; `sudo` is required for system-level modifications; variable values... (Note: The original text ends abruptly here.)
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