Hi @utariq_260
Welcome to Google Cloud Community!
You can have some options on this:
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In the Cloud Shell Menu, you can select Restart and a pop-up dialog shall ask for confirmation on Restart Cloud Shell. After this, a new VM shall be provisioned for you to use.
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You can also do safe mode to login as root and check any problem in your
.bashrcor.tmux.conffiles, to see documentation click here. -
After doing safe mode, if necessary, you can also get a completely new cloud shell state by following this link.
For more information you can check this official documentation.
I hope this information is helpful.
If you need further assistance, you can always file a ticket on our support team.

