Commit b2c8319e authored by Eli Zaretskii's avatar Eli Zaretskii
Browse files

(Interactive Shell): Document that EMACS is only put into the shell's

environment if it is not already defined.  From Francois Pinard.
parent 5333e22e
......@@ -392,7 +392,6 @@ and will store the decoded output into the file whose name is
specified in the encoded text.
@vindex shell-file-name
@cindex environment
Both @kbd{M-!} and @kbd{M-|} use @code{shell-file-name} to specify the
shell to use. This variable is initialized based on your @env{SHELL}
environment variable when Emacs is started. If the file name does not
......@@ -449,6 +448,7 @@ a buffer name, and create (or reuse) a subshell in that buffer. All
subshells in different buffers run independently and in parallel.
@vindex explicit-shell-file-name
@cindex environment variables for subshells
@cindex @env{ESHELL} environment variable
@cindex @env{SHELL} environment variable
The file name used to load the subshell is the value of the variable
......@@ -471,9 +471,11 @@ from. For example, if you use bash, the file sent to it is
specify a coding system after starting the shell by using @kbd{C-x
@key{RET} p} in the shell buffer. @xref{Specify Coding}.
Emacs defines the environment variable @env{EMACS} in the subshell,
with value @code{t}. A shell script can check this variable to
determine whether it has been run from an Emacs subshell.
@cindex @env{EMACS} environment variable
Unless the environment variable @env{EMACS} is already defined,
Emacs defines it in the subshell, with value @code{t}. A shell script
can check this variable to determine whether it has been run from an
Emacs subshell.
@node Shell Mode
@subsection Shell Mode
......
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