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Every time, when I'm using my VPS root account on linux shell, and then
I go to other user accounts, I will type # su otherusers, and then type exit go back to
root shell after typing password again. Is there any keyword/command  I can switch both root and user account without re-type su, type password ,type exit if I will do it many times  and without creating too many putty remote shell so that get less  error on less typing ?

Please advise

Rwiceing

if you are on remote.. "different multiple tty console" doesn't make sense....

So.. screen command is to initialize and join the screen later .. .eg.

user1$ screen -S scr1
user1$exit

root#screen -x scr1
root# exit

so whenever you want you can initialize multiple screen with multiple users and then you can use them.

TY/SA

To run a command as "otheruser" from root you can simply issue

su otheruser -c command

The non-root shell will terminate once "command" has completed, so there will be no need for "exit". root will not be asked for the password of "otheruser". If you need the environment set for "otheruser" add a hyphen to the "su" command call:

su - otheruser -c command

"su [-] otheruser -c" can be set as an alias ("less typing"):

alias as_otheruser="su - otheruser -c "

as_otheruser command

will now do the trick.

Likewise, you can run commands requiring root privileges from "otheruser" by means of "sudo" and appropriate entries in the "sudoers" file. There is an option in "sudoers" to avoid being prompted for passwords.

Log in directly as "otheruser" and run root commands like this:

sudo command_on_behalf_of_root

Frequently used sudo root commands can also be aliased, of course.

You can use "sudo" to run commands on behalf of other non-root users (if so configured):

From "otheruser":

sudo -u otheruser2 command_on_behalf_of_otheruser2

Finally, sudo can be used to start an interactive shell with the privileges of root or any "otheruser". No passwords required (if so configured). "exit" is required to terminate the shell, however.