When creating a folder, there may be illegal characters in the command, which made my entire mkdir command unusable. The prompt:
mkdir:11:command not found
was finally solved after my various attempts, so I will record it here.
1. Select shell->new command
In the dialog box that pops up, enter
mkdir disabled_shell_files
He will create a disabled_shell_files folder in your home directory
cd ~
You can switch to your home directory with the above command
Open a terminal, create a new command, and enter:
mv .profile .bash_history .bash_profile .bashrc .inputrc disabled_shell_files
If the deletion is not successful, you can try to delete this folder directly using the rm -rf command, and then try the mkdir command, and you will find that it can be used.