doc: describe exit command
Man-page for exit shell command.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/doc/usage/exit.rst b/doc/usage/exit.rst
new file mode 100644
index 0000000..769223c
--- /dev/null
+++ b/doc/usage/exit.rst
@@ -0,0 +1,40 @@
+exit command
+============
+
+Synopsis
+--------
+
+::
+
+ exit
+
+Description
+-----------
+
+The exit command terminates a script started via the run or source command.
+If scripts are nested, only the innermost script is left.
+
+::
+
+ => setenv inner 'echo entry inner; exit; echo inner done'
+ => setenv outer 'echo entry outer; run inner; echo outer done'
+ => run outer
+ entry outer
+ entry inner
+ outer done
+ =>
+
+When executed outside a script a warning is written. Following commands are not
+executed.
+
+::
+
+ => echo first; exit; echo last
+ first
+ exit not allowed from main input shell.
+ =>
+
+Return value
+------------
+
+$? is always set to 0 (true).
diff --git a/doc/usage/index.rst b/doc/usage/index.rst
index eedcdb1..b8f216b 100644
--- a/doc/usage/index.rst
+++ b/doc/usage/index.rst
@@ -17,6 +17,7 @@
bootefi
bootmenu
button
+ exit
mbr
pstore
sbi