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--- write_and_run_your_programs [2018/05/14 18:06] – yutaka
+++ write_and_run_your_programs [2018/05/14 18:46] – yutaka
@@ Line 87: / Line 87: @@
 This is useful because a sequence of programming (edit-compile-run-edit again) can be done by switching two windows.
+==== Run vi or vim ====
+**If you are satisfied with //gedit//, please skip this section and move to the next, or you will get confused.**
+Linux has a traditional text editor, //vi// (actually //vim// installed in many systems).
+This editor runs in the terminal so it doesn't open new window (and you don't need Xming or XQuartz).
+The //vi// editor is designed to intensively use keyboard without graphical guidance so it looks cryptic for new users.
+To invoke vi, type ''vi'' with a file name in a command line.
+   $ vi prog1.f90
+If you accidentally run vi, 1) hit //Esc// key once, 2) type '':q'', and 3) then hit Enter key.
+   :q
+The editor has 2 modes: //command mode// and //edit mode//.
+You have to switch the modes inside the editor to do what you want to do.
+   * When starting the editor, you are in the command mode which accept the command to action such as exit the program, save a file, search a text etc.
+   * To input the text, push a single key ''i'' (meaning //insert//) or ''a'' (//add//) to move on the edit mode (no Enter key).
+   * To save the file, push ''Esc'' key to come back to the command mode, type '':w'' (//write//), and hit the Enter key.
+   * To edit the file again, push ''i'' or ''a''.
+   * You have to move to the edit mode and come back to the command mode repeatedly to finish the program. Then type '':q'' in the command mode to quit the program.
+You should know which which model are you currently working.
+{{:wiki:vimode.png?direct|}}
+Hints:
+  * If you get lost, hit the ''Esc'' key (on the top left of the keyboard) a few times so you will move to the command mode.
+  * The simplest way to quit //vi//: hit the Esc key many times, type '':q'', and hit the Enter key.
 ===== Write, compile, and run the first program =====
@@ Line 134: / Line 167: @@
 The program shows some message on the screen and exits.
 ==== Some compilation options ====