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How does an asynchronous shell work in Emacs?
The asynchronous version will use the buffer *Async Shell Command* for its output. If you prefix the command with the universal argument, C-u, Emacs will insert the output of the shell command into the current buffer at point. This feature is a god send, for mostly obvious reasons.
How to invoke shell command on region in Emacs?
To use it, you can invoke either shell-command-on-region or its shortcut, M-|. The marked text is sent, verbatim, to the shell command and its output. If you want Emacs to replace the region with the output returned from the command, you should prefix the command with the universal argument, C-u.
How does the exit code work in Emacs?
Emacs will display the exit code of the terminating command in the mode line if it is non-zero. Any output sent to standard error will be interspersed as though it came from standard out; if you want it sent to its own buffer you must set shell-command-default-error-buffer to the name of a buffer you want it sent to.
How to change the default error buffer in Emacs?
If you want Emacs to replace the region with the output returned from the command, you should prefix the command with the universal argument, C-u. If shell-command-default-error-buffer is set, as with the aforementioned commands, then an error buffer, and any text sent to standard error, is displayed there instead.
How do I switch to scratch buffer in Emacs?
Press C-x o to switch windows (or click on the new window), move to the buffer called scratch, and press Enter. That window should change to a view of another buffer, which by default is there as a scratchpad. If you know the name of a buffer, you can also switch to it in the currently selected window with
Is there an Emacs shell written in eshell?
Eshell is a shell written entirely in Emacs-Lisp, and it replicates most of the features and commands from GNU CoreUtils and the Bourne-like shells. So by re-writing common commands like ls and cp in Emacs-Lisp, Eshell will function identically on any environment Emacs itself runs on.
Why is my Emacs thrown off when I Change Directory?
The built-in mechanism for keeping Emacs apprised of the shell’s current directory is not very reliable, and can be thrown off by any command which it doesn’t recognize as a directory-changing command (i.e., shell aliases).
Can you use the shell region command in Python?
You are not limited to just one command. You can use the shell region command to invoke shell code (or python code, or..) by passing something like sh, bash, or python as a command. You may have to adjust shell-command-switch if you use it on esoteric interpreters or shells (though the default will work with sh, bash and python .)