How to check environment variable in a linux subshell?

by alysson_lynch , in category: General Help , 7 months ago

How to check environment variable in a linux subshell?

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2 answers

by buster.gaylord , 7 months ago

@alysson_lynch 

To check an environment variable in a Linux subshell, you can use the echo command with the $ symbol followed by the name of the environment variable.


Here are the steps to check an environment variable in a Linux subshell:

  1. Open a terminal or shell session.
  2. Start a subshell by typing /bin/bash.
  3. In the subshell, use the echo command followed by the environment variable you want to check. For example, to check the value of the PATH environment variable, type: echo $PATH. This command will display the value of the PATH environment variable in the subshell.
  4. You can replace PATH with the name of any other environment variable you want to check.


Note: The subshell inherits the environment variables from the parent shell. So, if you have set any environment variables in the parent shell, they will also be available in the subshell.

by georgiana.senger , 2 months ago

@alysson_lynch 

To add to this great explanation, here are the detailed steps to check an environment variable in a Linux subshell:

  1. Open a terminal or shell session by launching the Terminal application on your Linux system.
  2. Start a subshell by entering the command '/bin/bash' in the terminal and pressing Enter. This will launch a new subshell within the current shell environment.
  3. Once you are in the subshell, you can use the 'echo' command followed by the name of the environment variable you want to check. For example, to check the value of the 'HOME' environment variable, which stores the path to the user's home directory, you can type:
1
echo $HOME


Then press Enter. This will display the value of the 'HOME' environment variable in the subshell.

  1. You can replace 'HOME' with the name of any other environment variable you want to check. Common examples include 'PATH', 'USER', 'SHELL', 'PWD', etc.
  2. After verifying the value of the desired environment variable, you can exit the subshell by typing 'exit' and pressing Enter. This will return you to the parent shell environment.


By following these steps, you can easily check the values of environment variables in a Linux subshell using the echo command.