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There are two types of editing modes available in POSIX and
Korn Shell: the vi
mode and the emacs
mode. A discussion of each of these methods follows. These Shell
editing modes emulate the corresponding editors and all common commands
are the same. Inline editing is very similar to using the editor
in that inline editing uses the common editor's commands. Using vi Line Edit Mode | |
The vi editing mode uses the same commands as the vi
editor. If you are unfamiliar with the vi
editor, see Using HP-UX, or The
Ultimate Guide to the vi and ex Text Editors. Enabling vi Line Edit ModeThere are several ways to enable the vi editing mode. One
is to type: For further details on the set
command see Chapter 23 “Advanced Concepts and Commands”. Another is to set and export the VISUAL
shell variable in your .profile
or .kshrc, to
a value ending in vi: If VISUAL
is assigned a string that ends in vi,
gmacs, or emacs,
then the corresponding editor mode is enabled. Finally, you can set and export EDITOR
in your .profile
or .kshrc: Now, if VISUAL
is not set, and EDITOR
is assigned a string containing vi,
gmacs, or emacs,
then the corresponding editor mode is enabled. Now, you are ready to perform inline editing. Enabling an
editor mode places you into the editor's command
mode, although when typing it does not appear anything has changed.
This allows you to continue typing and executing command lines as
before. It also allows you to type ESC
and enter input mode. Once you are in input
mode, you can edit the specified line using most vi
commands and then re-execute it by typing Return.
For example, suppose you type: Then, before you press the Return,
press ESC. Now you can move on
the line using Backspace (not
LeftArrow) to the point where
you made your mistake. Then you execute the vi
delete command, x,
to remove the extra r
and the append command, A,
to add the letter e
to the end of the line: $ echo surprrisESCBackspaceBackspacexAeESCReturn |
The new line and output looks like this: For a complete listing of all the vi
commands usable within the POSIX and Korn Shell vi
mode, see the sh-posix(1) and ksh(1)
manual pages in the HP-UX Reference. Using emacs and gmacs Line Edit Mode | |
The other editors implemented for inline editing are emacs
and gmacs. The
only difference between these two editor modes is the function of
the CTRL-T
command (which transposes characters). With these editors there is no command mode; you are always
in input mode. To use emacs
or gmacs commands,
you hold the CTRL key down while
pressing a character key or press ESC
followed by a character key. Enabling emacs Line Edit ModeAgain, there are different ways to enable emacs
or gmacs mode.
One is to type: or The other is to set either VISUAL
or EDITOR as
described in “Enabling vi Line Edit Mode”. Now, you are ready to perform inline editing with emacs.
As you know, enabling an editor mode places you into the editor's
command mode. Although, to you it does not
appear anything has changed as you continue typing in and executing
command lines. For example, suppose you type: Before you press the Return,
press four CTRL-Bs.
This moves you left on the line to the point where you made your
first mistake. Then, it is a simple matter of executing the CTRL-D
or delete command on the extra r.
To move forward again, use CTRL-E
to move the cursor to the end of the line. Now, simply type in the
rest of the line: $ echo surrpriCTRL-BCTRL-BCTRL-BCTRL-BCTRL-DCTRL-EseReturn |
The new line and output looks like this: There are also ESC sequences
that move you forward and backward by words rather than letters:
ESCb
moves you backward one word and ESCf
moves you forward one word. For a complete listing of all the emacs
commands usable within the POSIX and Korn Shell emacs
mode, see the sh-posix(1) and ksh(1)
manual entries in the HP-UX Reference. |
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