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<H1>Eli User Interface Reference Manual</H1>
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<H1><A NAME="SEC14" HREF="ui_toc.html#SEC14">The Command Editing Mechanism</A></H1>
<P>
During an interactive Eli session, an odin-command may be edited
before it is interpreted by typing either control characters
or escape sequences.
(An escape sequence is entered by typing <KBD>ESC</KBD> followed by one or
more characters.
Note that unlike control keys, case matters in escape sequences;
<KBD>ESC F</KBD> is not the same as <KBD>ESC f</KBD>.)
<P>
A control character or escape sequence may be typed anywhere on the line,
not just at the beginning.
In addition, a return may also be typed anywhere on the line, not just at
the end.
<P>
Most control characters and escape sequences may be given a repeat count,
<VAR>n</VAR>, where <VAR>n</VAR> is a number.
To enter a repeat count, type the escape key, the number, and then
the character or escape sequence:
<P>
<PRE>
ESC 4 ^F
</PRE>
<P>
This sequence moves the cursor forward four characters.
If a command may be given a repeat count then the text "[<VAR>n</VAR>]"
is given at the end of its description.
<P>
Eli accepts the following control characters when editing odin-commands:
<P>
<DL COMPACT>
<DT><KBD>^A</KBD>
<DD>Move to the beginning of the line
<P>
<DT><KBD>^B</KBD>
<DD>Move left (backwards) [<VAR>n</VAR>]
<P>
<DT><KBD>^D</KBD>
<DD>Delete character [<VAR>n</VAR>]
<P>
<DT><KBD>^E</KBD>
<DD>Move to end of line
<P>
<DT><KBD>^F</KBD>
<DD>Move right (forwards) [<VAR>n</VAR>]
<P>
<DT><KBD>^G</KBD>
<DD>Ring the bell
<P>
<DT><KBD>^H</KBD>
<DD>Delete character before cursor (backspace key) [<VAR>n</VAR>]
<P>
<DT><KBD>^I</KBD>
<DD>Complete filename (tab key); see below
<P>
<DT><KBD>^J</KBD>
<DD>Done with line (return key)
<P>
<DT><KBD>^K</KBD>
<DD>Kill to end of line (or column [<VAR>n</VAR>])
<P>
<DT><KBD>^L</KBD>
<DD>Redisplay line
<P>
<DT><KBD>^M</KBD>
<DD>Done with line (alternate return key)
<P>
<DT><KBD>^N</KBD>
<DD>Get next line from history [<VAR>n</VAR>]
<P>
<DT><KBD>^P</KBD>
<DD>Get previous line from history [<VAR>n</VAR>]
<P>
<DT><KBD>^R</KBD>
<DD>Search backward (forward if [<VAR>n</VAR>]) through history for text;
must start line if text begins with an uparrow
<P>
<DT><KBD>^T</KBD>
<DD>Transpose characters
<P>
<DT><KBD>^V</KBD>
<DD>Insert next character, even if it is an edit command
<P>
<DT><KBD>^W</KBD>
<DD>Wipe to the mark
<P>
<DT><KBD>^X^X</KBD>
<DD>Exchange current location and mark
<P>
<DT><KBD>^Y</KBD>
<DD>Yank back last killed text
<P>
<DT><KBD>^[</KBD>
<DD>Start an escape sequence (escape key)
<P>
<DT><KBD>^]<VAR>c</VAR></KBD>
<DD>Move forward to next character <VAR>c</VAR>
<P>
<DT><KBD>^?</KBD>
<DD>Delete character before cursor (delete key) [<VAR>n</VAR>]
</DL>
<P>
Eli accepts the following escape sequences when editing odin-commands:
<P>
<DL COMPACT>
<DT><KBD>ESC ^H</KBD>
<DD>Delete previous word (backspace key) [<VAR>n</VAR>]
<P>
<DT><KBD>ESC DEL</KBD>
<DD>Delete previous word (delete key) [<VAR>n</VAR>]
<P>
<DT><KBD>ESC SP</KBD>
<DD>Set the mark (space key); see ^X^X and ^Y above
<P>
<DT><KBD>ESC .</KBD>
<DD>Get the last (or [<VAR>n</VAR>]'th) word from previous line
<P>
<DT><KBD>ESC ?</KBD>
<DD>Show possible completions; see below
<P>
<DT><KBD>ESC <</KBD>
<DD>Move to start of history
<P>
<DT><KBD>ESC ></KBD>
<DD>Move to end of history
<P>
<DT><KBD>ESC b</KBD>
<DD>Move backward a word [<VAR>n</VAR>]
<P>
<DT><KBD>ESC d</KBD>
<DD>Delete word under cursor [<VAR>n</VAR>]
<P>
<DT><KBD>ESC f</KBD>
<DD>Move forward a word [<VAR>n</VAR>]
<P>
<DT><KBD>ESC l</KBD>
<DD>Make word lowercase [<VAR>n</VAR>]
<P>
<DT><KBD>ESC m</KBD>
<DD>Toggle whether 8-bit chars display normally or with the <CODE>M-</CODE> prefix
<P>
<DT><KBD>ESC u</KBD>
<DD>Make word uppercase [<VAR>n</VAR>]
<P>
<DT><KBD>ESC y</KBD>
<DD>Yank back last killed text
<P>
<DT><KBD>ESC w</KBD>
<DD>Make area up to mark yankable
<P>
<DT><KBD>ESC <VAR>nn</VAR></KBD>
<DD>Set repeat count to the number <VAR>nn</VAR>
<P>
<DT><KBD>ESC <VAR>C</VAR></KBD>
<DD>Read from environment variable <VAR>_C_</VAR>, where <VAR>C</VAR> is an uppercase letter
</DL>
<P>
If you type the escape key followed by an uppercase letter, <VAR>C</VAR>,
then the contents of the environment variable <VAR>_C_</VAR>
are read in as if you had typed them at the keyboard.
For example, if the variable <CODE>_L_</CODE> contains the following:
<P>
<PRE>
^A^Kecho '^V^[[H^V^[[2J'^M
</PRE>
<P>
Then typing <CODE>ESC L</CODE> will move to the beginning of the line, kill the
entire line, enter the echo command needed to clear the terminal (if your
terminal is like a VT-100), and send the line back to Eli.
<P>
The command editing mechanism also supports filename completion.
Suppose the root directory has the following files in it:
<P>
<PRE>
bin vmunix core vmunix.old
</PRE>
<P>
If you type <CODE>rm /v</CODE> and then the tab key, Eli will finish off
as much of the name as possible by adding <CODE>munix</CODE>.
Because the name is not unique, it will then beep.
If you type the escape key and a question mark, it will display the
two choices.
If you then type a period and a tab, Eli will finish off the filename
for you:
<P>
<PRE>
rm /v[TAB]<VAR>munix</VAR>.[TAB]<VAR>old</VAR>
</PRE>
<P>
The tab key is shown by <CODE>[TAB]</CODE> and the automatically-entered text
is shown as <VAR>munix</VAR>.
<P>
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