1<html lang="en"> 2<head> 3<title>Introduction and Notation - Debugging with GDB</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Debugging with GDB"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="up" href="Command-Line-Editing.html#Command-Line-Editing" title="Command Line Editing"> 9<link rel="next" href="Readline-Interaction.html#Readline-Interaction" title="Readline Interaction"> 10<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 11<!-- 12Copyright (C) 1988-2013 Free Software Foundation, Inc. 13 14Permission is granted to copy, distribute and/or modify this document 15under the terms of the GNU Free Documentation License, Version 1.3 or 16any later version published by the Free Software Foundation; with the 17Invariant Sections being ``Free Software'' and ``Free Software Needs 18Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,'' 19and with the Back-Cover Texts as in (a) below. 20 21(a) The FSF's Back-Cover Text is: ``You are free to copy and modify 22this GNU Manual. Buying copies from GNU Press supports the FSF in 23developing GNU and promoting software freedom.'' 24--> 25<meta http-equiv="Content-Style-Type" content="text/css"> 26<style type="text/css"><!-- 27 pre.display { font-family:inherit } 28 pre.format { font-family:inherit } 29 pre.smalldisplay { font-family:inherit; font-size:smaller } 30 pre.smallformat { font-family:inherit; font-size:smaller } 31 pre.smallexample { font-size:smaller } 32 pre.smalllisp { font-size:smaller } 33 span.sc { font-variant:small-caps } 34 span.roman { font-family:serif; font-weight:normal; } 35 span.sansserif { font-family:sans-serif; font-weight:normal; } 36--></style> 37<link rel="stylesheet" type="text/css" href="../cs.css"> 38</head> 39<body> 40<div class="node"> 41<a name="Introduction-and-Notation"></a> 42<p> 43Next: <a rel="next" accesskey="n" href="Readline-Interaction.html#Readline-Interaction">Readline Interaction</a>, 44Up: <a rel="up" accesskey="u" href="Command-Line-Editing.html#Command-Line-Editing">Command Line Editing</a> 45<hr> 46</div> 47 48<h3 class="section">32.1 Introduction to Line Editing</h3> 49 50<p>The following paragraphs describe the notation used to represent 51keystrokes. 52 53 <p>The text <kbd>C-k</kbd> is read as `Control-K' and describes the character 54produced when the <k> key is pressed while the Control key 55is depressed. 56 57 <p>The text <kbd>M-k</kbd> is read as `Meta-K' and describes the character 58produced when the Meta key (if you have one) is depressed, and the <k> 59key is pressed. 60The Meta key is labeled <ALT> on many keyboards. 61On keyboards with two keys labeled <ALT> (usually to either side of 62the space bar), the <ALT> on the left side is generally set to 63work as a Meta key. 64The <ALT> key on the right may also be configured to work as a 65Meta key or may be configured as some other modifier, such as a 66Compose key for typing accented characters. 67 68 <p>If you do not have a Meta or <ALT> key, or another key working as 69a Meta key, the identical keystroke can be generated by typing <ESC> 70<em>first</em>, and then typing <k>. 71Either process is known as <dfn>metafying</dfn> the <k> key. 72 73 <p>The text <kbd>M-C-k</kbd> is read as `Meta-Control-k' and describes the 74character produced by <dfn>metafying</dfn> <kbd>C-k</kbd>. 75 76 <p>In addition, several keys have their own names. Specifically, 77<DEL>, <ESC>, <LFD>, <SPC>, <RET>, and <TAB> all 78stand for themselves when seen in this text, or in an init file 79(see <a href="Readline-Init-File.html#Readline-Init-File">Readline Init File</a>). 80If your keyboard lacks a <LFD> key, typing <C-j> will 81produce the desired character. 82The <RET> key may be labeled <Return> or <Enter> on 83some keyboards. 84 85 </body></html> 86 87