1. CS 497C – Introduction to UNIX Lecture 19: - The GNU emacs Editor Chin-Chih Chang chang@cs.twsu.edu chang@cs.twsu.edu

2. Searching with Regular Expressions If you can search for both michael and michel with this expression: mich*el. You can also use a character class to specify a single character in that class. The pattern that matches both christie or christy should be christ[iy]e*. You can use ^ and # to match an expression at the beginning and end of line, respectively.

3. Searching with Regular Expressions To search forward with regular expressions in an incremental manner, use [Ctrl-Alt-s] key sequence, type the regular expressions and then [Enter]. To repeat a regular expression search, use [Ctrl-Alt-s][Enter][Enter].

4. Search and Replace To globally replace the word Internet with World Wide Web without interaction, first press [Alt-x] and then enter the replace- string command. This command completion feature can be done by using [Alt-x]repl[Tab]s[Tab]. First enter the string to be replaced and then enter the target string.

5. Search and Replace You can replace strings in an interactive manner with the query-replace facility. The query-replace command is done by [Alt-%]. Then enter the string to be replaced and the target string.

6. Using Multiple Files, Windows and Buffers To view the same file in two separate windows, use [Ctrl-x]2. To move to the other window, the command is [Ctrl-x]o. You can increase the window’s vertical size by [Ctrl-x]^. You can open different file by [Ctrl-x][Ctrl-f].

7. Using Multiple Files, Windows and Buffers To replace current buffer, use [Ctrl-x][Ctrl-v]. To close other windows, use [Ctrl-x]1. To close the current window, use [Ctrl-x]0. To call up another buffer, use [Ctrl-x]b. You can insert a file into the current file by using [Ctrl-x]i filename.

8. Escape to Shell To escape to shell, use [Ctrl-x][Ctrl-z] or [Alt-x]shell. Enter fg to return to emacs. To execute a UNIX command, use [Alt-!]. The help facility is invoked with [Ctrl-h]. To access help by key, use [Ctrl-h]k and enter the key sequence. To close the help window, use [Ctrl-x]1.

9. Using the Help Facility [Ctrl-h] To know what a command does, use [Ctrl-h]f (function) and enter the command. To know the key binding, use [Ctrl-h]w (where-is) and enter the command. To run the tutorial, use [Ctrl-h]t (tutorial). To quit the tutorial, use [Ctrl-x]b to quit to the previous buffer. To read the emacs documentation, use [Ctrl-h]i (information).