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What is the difference between eshell (M-x eshell) and shell (M-x shell) in emacs. Both seems to work same but when i try to run su command or sudo command in eshell then it create a buffer named tramp/su root:localhost. but don't do the work which i want to do as super user.
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Emacs comes with its own shell (as in, like bash or zsh ) written in entirely in Emacs-Lisp. The shell, named Eshell, is a feature-rich replacement for your standard-fare shells like bash with the added bonus of working on any platform Emacs runs on.
To exit the shell when a foreground process has completed: Type exit or <EscChar-D>. Scroll past all the output data (or use an autoscroll function key if you have customized a function key to do that), and exit.
Killing Emacs means terminating the Emacs program. To do this, type C-x C-c ( save-buffers-kill-terminal ). A two-character key sequence is used to make it harder to type by accident. If there are any modified file-visiting buffers when you type C-x C-c , Emacs first offers to save these buffers.
C-u M-x shell will do it. It will prompt for a name for the new shell, just hit return for the default (which will be something like *shell*<2> . Also works with eshell.
In short eshell is a shell emulator (written in Emacs-Lisp), while shell is an interface to sh or whatever (external) system shell you're using.
eshell should behave like most "Bourne-style" shells that you're familiar with, but does not have the external dependency that shell has. Thus, it can be run on any system that runs emacs.
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