How to check current shell?

To check your current shell in a Linux environment, you can use one of the following methods:

Method 1: Using the echo Command

You can use the echo command to display the value of the $SHELL environment variable, which indicates your current shell:

echo $SHELL

This will output the path of your current shell, such as /bin/bash, /bin/zsh, or /bin/sh.

Method 2: Using the ps Command

You can also use the ps command to see the currently running shell process:

ps -p $$

This command will display information about the current shell process. The output will include the PID (Process ID) and the command name, which indicates your current shell.

Method 3: Using the basename Command

If you want just the name of the shell without the full path, you can combine echo with basename:

basename $SHELL

This will return just the shell name, like bash or zsh.

Example Output

If you run echo $SHELL, you might see:

/bin/bash

If you run ps -p $$, you might see:

  PID TTY          TIME CMD
 1234 pts/0    00:00:00 bash

Summary

These methods will help you determine which shell you are currently using. If you have any further questions or need assistance, feel free to ask!