new file mode 100644
@@ -0,0 +1,65 @@
+for command
+===========
+
+Synopis
+-------
+
+::
+
+ for <variable> in <items>; do <commands>; done
+
+Description
+-----------
+
+The for command is used to loop over a list of values and execute a series of
+commands for each of these.
+
+The counter variable of the loop is a shell variable. Please, keep in mind that
+an environment variable takes precedence over a shell variable of the same name.
+
+variable
+ Name of the counter variable
+
+items
+ Space separated item list
+
+commands
+ commands to execute
+
+Example
+-------
+
+::
+
+ => setenv c
+ => for c in 1 2 3; do echo item ${c}; done
+ item 1
+ item 2
+ item 3
+ => echo ${c}
+ 3
+ => setenv c x
+ => for c in 1 2 3; do echo item ${c}; done
+ item x
+ item x
+ item x
+ =>
+
+The first line ensures that there is no environment variable *c*. Hence in the
+first loop the shell variable *c* is printed.
+
+After defining an environment variable of name *c* it takes precedence over the
+shell variable and the environment variable is printed.
+
+Return value
+------------
+
+The return value $? after the done statement is the return value of the last
+statement executed in the loop.
+
+::
+
+ => for i in true false; do ${i}; done; echo $?
+ 1
+ => for i in false true; do ${i}; done; echo $?
+ 0
@@ -18,6 +18,7 @@ Shell commands
bootmenu
button
exit
+ for
mbr
pstore
sbi
Create a man-page for the for statement. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de> --- doc/usage/for.rst | 65 +++++++++++++++++++++++++++++++++++++++++++++ doc/usage/index.rst | 1 + 2 files changed, 66 insertions(+) create mode 100644 doc/usage/for.rst -- 2.29.2