<a name="environment-variables"><dt>environment variables: <a href="../ch05_03.htm#IXT-5-122958">5.3.5. Environment Variables</a></dt><dd><dl>    <a name="modifying-values">  <dt>modifying values: <a href="../ch02_01.htm#IXT-2-122049">2.1. Alphabetical Summary of Commands</a></dt>      <a name="printing-values-of">  <dt>printing values of: <a href="../ch02_01.htm#IXT-2-122352">2.1. Alphabetical Summary of Commands</a></dt>  </dl></dd><!-- ========================== --><a name="EOF-end-of-file-character"><dt>EOF (end-of-file character): <a href="../ch00_03.htm#IXT-0-121770">0.3. Conventions</a></dt><!-- ========================== --><a name="eqn-preprocessor-nroff-troff"><dt>eqn preprocessor (nroff/troff): <a href="../ch02_01.htm#IXT-2-121876">2.1. Alphabetical Summary of Commands</a></dt><dd><dl>  <dt><a href="../ch17_02.htm#unut-ch-17-ix-eqn-preprocessor">17.2. eqn</a></dt></dl></dd><!-- ========================== --><a name="equations-formatting-in-nroff-troff"><dt>equations, formatting in nroff/troff: <a href="../ch17_02.htm#unut-ch-17-ix-equations-formatting-in-nroff-troff">17.2. eqn</a></dt><!-- ========================== --><a name="erasing"><dt>erasing (see <a href="idx_d.htm#deleting">deleting</a>)</dt><!-- ========================== --><a name="error-command"><dt>error command: <a href="../ch02_01.htm#IXT-2-122050">2.1. Alphabetical Summary of Commands</a></dt><!-- ========================== --><a name="error-messages"><dt>error messages</dt><dd><dl>    <a name="compiler">  <dt>compiler: <a href="../ch02_01.htm#IXT-2-122052">2.1. Alphabetical Summary of Commands</a></dt>      <a name="formatting">  <dt>formatting: <a href="../appb_02.htm#IXT-B-121645"> B.2. Alphabetical Summary of Commands</a></dt>  </dl></dd><!-- ========================== --><a name="esac-command"><dt>esac command: <a href="../ch04_09.htm#IXT-4-122839">4.9. Built-in Commands (Bourne and Korn Shells)</a></dt><!-- ========================== --><a name="escape-sequences-displaying"><dt>escape sequences, displaying: <a href="../ch02_01.htm#IXT-2-121909">2.1. Alphabetical Summary of Commands</a></dt><!-- ========================== --><a name="-etc-directory"><dt>/etc directory</dt><dd><dl>    <a name="-etc-passwd-file">  <dt>/etc/passwd file: <a href="../ch03_03.htm#IXT-3-122636">3.3. Shell Flavors</a></dt><dd><dl>    <dt><a href="../ch05_02.htm#IXT-5-122912">5.2.1. Special Files</a></dt>  </dl></dd>      <a name="-etc-profile-file">  <dt>/etc/profile file: <a href="../ch04_02.htm#IXT-4-122643">4.2.1. Special Files</a></dt><dd><dl>    <dt><a href="../ch04_02.htm#IXT-4-122644">4.2.1. Special Files</a></dt>    <dt>(see also <a href="idx_s.htm#shell-variables">shell variables</a>)</dt>  </dl></dd>  </dl></dd><!-- ========================== --><a name="eval-command"><dt>eval command: <a href="../ch04_09.htm#IXT-4-122840">4.9. Built-in Commands (Bourne and Korn Shells)</a></dt><dd><dl>  <dt><a href="../ch05_08.htm#IXT-5-123049">5.8. Built-in C Shell Commands</a></dt></dl></dd><!-- ========================== --><a name="evaluating-expressions"><dt>evaluating expressions: <a href="../ch02_01.htm#IXT-2-122065">2.1. Alphabetical Summary of Commands</a></dt><!-- ========================== --><a name="ex-editor"><dt>ex editor: <a href="../ch02_01.htm#IXT-2-122054">2.1. Alphabetical Summary of Commands</a></dt><dd><dl>  <dt><a href="../ch09_01.htm#unut-ch-9-ix-ex-editor">9. The ex Editor</a></dt>    <a name="command-syntax">  <dt>command syntax: <a href="../ch09_01.htm#IXT-9-123168">9.1. Syntax of ex Commands</a></dt>      <a name="commands-list-of">  <dt>commands, list of: <a href="../ch09_02.htm#IXT-9-123170">9.2. Alphabetical Summary of ex Commands</a></dt>      <a name="pattern-matching-metacharacters">  <dt>pattern-matching metacharacters: <a href="../ch06_02.htm#IXT-6-123096">6.2. Metacharacters, Listed by Unix Program</a></dt>      <a name="search-and-replace-examples">  <dt>search-and-replace examples: <a href="../ch06_04.htm#IXT-6-123116">6.4.5. Examples of Searching and Replacing</a></dt>  </dl></dd><!-- ========================== --><a name="exec-command"><dt>exec command: <a href="../ch04_09.htm#IXT-4-122841">4.9. Built-in Commands (Bourne and Korn Shells)</a></dt><dd><dl>  <dt><a href="../ch05_08.htm#IXT-5-123050">5.8. Built-in C Shell Commands</a></dt></dl></dd><!-- ========================== --><a name="executable-files-shared-objects-for"><dt>executable files, shared objects for: <a href="../ch02_01.htm#IXT-2-122219">2.1. Alphabetical Summary of Commands</a></dt><!-- ========================== --><a name="executing-commands"><dt>executing commands</dt><dd><dl>    <a name="after-logout">  <dt>after logout: <a href="../ch02_01.htm#IXT-2-122327">2.1. Alphabetical Summary of Commands</a></dt>      <a name="of-lower-priority">  <dt>of lower priority: <a href="../ch02_01.htm#IXT-2-122317">2.1. Alphabetical Summary of Commands</a></dt>      <a name="wait-between">  <dt>wait between: <a href="../ch02_01.htm#IXT-2-122414">2.1. Alphabetical Summary of Commands</a></dt>  </dl></dd><!-- ========================== --><a name="EXINIT-environment-variable"><dt>EXINIT environment variable: <a href="../ch05_03.htm#IXT-5-122964">5.3.5. Environment Variables</a></dt><!-- ========================== --><a name="exit-command-awk"><dt>exit command (awk): <a href="../ch11_10.htm#IXT-11-123318">11.10. Alphabetical Summary of Functions and Commands</a></dt><!-- ========================== --><a name="exit-command-csh"><dt>exit command (csh): <a href="../ch05_08.htm#IXT-5-123051">5.8. Built-in C Shell Commands</a></dt><!-- ========================== --><a name="exit-command-ksh-sh"><dt>exit command (ksh, sh): <a href="../ch04_09.htm#IXT-4-122842">4.9. Built-in Commands (Bourne and Korn Shells)</a></dt><!-- ========================== --><a name="exit-status"><dt>exit status: <a href="../ch02_01.htm#IXT-2-122483">2.1. Alphabetical Summary of Commands</a></dt><dd><dl>    <a name="commands">  <dt>commands: <a href="../ch02_01.htm#IXT-2-122502">2.1. Alphabetical Summary of Commands</a></dt>  </dl></dd><!-- ========================== --><a name="exp-function-awk"><dt>exp function (awk): <a href="../ch11_10.htm#IXT-11-123319">11.10. Alphabetical Summary of Functions and Commands</a></dt><!-- ========================== --><a name="expand-command"><dt>expand command: <a href="../ch02_01.htm#IXT-2-122057">2.1. Alphabetical Summary of Commands</a></dt><!-- ========================== --><a name="expanding-files"><dt>expanding files: <a href="../appb_02.htm#IXT-B-121728"> B.2. Alphabetical Summary of Commands</a></dt><dd><dl>  <dt>(see also <a href="idx_p.htm#pack-command;-pcat-command">pack command; pcat command</a>)</dt></dl></dd><!-- ========================== --><a name="export-command"><dt>export command: <a href="../ch04_09.htm#IXT-4-122843">4.9. Built-in Commands (Bourne and Korn Shells)</a></dt><!-- ========================== --><a name="expr-command"><dt>expr command: <a href="../ch02_01.htm#IXT-2-122063">2.1. Alphabetical Summary of Commands</a></dt><!-- ========================== --><a name="expressions-C-shell"><dt>expressions, C shell: <a href="../ch05_04.htm#unut-ch-5-ix-expressions-c-shell">5.4. Expressions</a></dt><!-- ========================== --><a name="expressions-evaluating"><dt>expressions, evaluating: <a href="../ch02_01.htm#IXT-2-122064">2.1. Alphabetical Summary of Commands</a></dt><!-- ========================== --><a name="exstr-command"><dt>exstr command: <a href="../ch02_01.htm#IXT-2-122066">2.1. Alphabetical Summary of Commands</a></dt><!-- ========================== --><a name="extracting-columns-fields-from-files"><dt>extracting columns/fields from files: <a href="../ch02_01.htm#IXT-2-121946">2.1. 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