mksh - Can I update the adb shell's environment variables?

I wanted to update the PATH environment variable permanently in the adb shell. I guessed the shell was mksh for I've found /system/bin/sh pointing to /system/bin/mksh. Then I tried

• Making a new file /data/.mkshrc and adding the PATH definition into it.


• Copy the above file into /.



• Copy to /root.

But all attempts failed.