mirror of
https://github.com/rawiriblundell/wiki.bash-hackers.org
synced 2024-11-02 00:53:07 +01:00
485 lines
30 KiB
Plaintext
485 lines
30 KiB
Plaintext
<!DOCTYPE html>
|
|
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" dir="ltr" class="no-js">
|
|
<head><script type="text/javascript" src="/_static/js/bundle-playback.js?v=TPXmWR5s" charset="utf-8"></script>
|
|
<script type="text/javascript" src="/_static/js/wombat.js?v=txqj7nKC" charset="utf-8"></script>
|
|
<script type="text/javascript">
|
|
__wm.init("http://web.archive.org/web");
|
|
__wm.wombat("https://wiki.bash-hackers.org/syntax/ccmd/classic_for?do=edit","20230326132808","http://web.archive.org/","web","/_static/",
|
|
"1679837288");
|
|
</script>
|
|
<link rel="stylesheet" type="text/css" href="/_static/css/banner-styles.css?v=S1zqJCYt" />
|
|
<link rel="stylesheet" type="text/css" href="/_static/css/iconochive.css?v=qtvMKcIJ" />
|
|
<!-- End Wayback Rewrite JS Include -->
|
|
|
|
<meta charset="UTF-8"/>
|
|
<title>The classic for-loop [Bash Hackers Wiki]</title>
|
|
<script>(function(H){H.className=H.className.replace(/\bno-js\b/,'js')})(document.documentElement)</script>
|
|
<meta name="viewport" content="width=device-width,initial-scale=1"/>
|
|
<link rel="shortcut icon" href="/web/20230326132808im_/https://wiki.bash-hackers.org/lib/tpl/bootstrap3/images/favicon.ico"/>
|
|
<link rel="apple-touch-icon" href="/web/20230326132808im_/https://wiki.bash-hackers.org/lib/tpl/bootstrap3/images/apple-touch-icon.png"/>
|
|
<meta name="generator" content="DokuWiki"/>
|
|
<meta name="robots" content="noindex,nofollow"/>
|
|
<link type="text/css" rel="stylesheet" href="/web/20230326132808cs_/https://wiki.bash-hackers.org/lib/tpl/bootstrap3/assets/bootstrap/default/bootstrap.min.css"/>
|
|
<link rel="search" type="application/opensearchdescription+xml" href="/web/20230326132808/https://wiki.bash-hackers.org/lib/exe/opensearch.php" title="Bash Hackers Wiki"/>
|
|
<link rel="start" href="/"/>
|
|
<link rel="contents" href="/syntax/ccmd/classic_for?do=index" title="Sitemap"/>
|
|
<link rel="manifest" href="/web/20230326132808/https://wiki.bash-hackers.org/lib/exe/manifest.php"/>
|
|
<link rel="alternate" type="application/rss+xml" title="Recent Changes" href="/web/20230326132808/https://wiki.bash-hackers.org/feed.php"/>
|
|
<link rel="alternate" type="application/rss+xml" title="Current namespace" href="/web/20230326132808/https://wiki.bash-hackers.org/feed.php?mode=list&ns=syntax:ccmd"/>
|
|
<link rel="alternate" type="text/html" title="Plain HTML" href="/web/20230326132808/https://wiki.bash-hackers.org/_export/xhtml/syntax/ccmd/classic_for"/>
|
|
<link rel="alternate" type="text/plain" title="Wiki Markup" href="/web/20230326132808/https://wiki.bash-hackers.org/_export/raw/syntax/ccmd/classic_for"/>
|
|
<link rel="stylesheet" type="text/css" href="/web/20230326132808cs_/https://wiki.bash-hackers.org/lib/exe/css.php?t=bootstrap3&tseed=54923c3deda180f2db5bd755cd8fbf1a"/>
|
|
<!--[if gte IE 9]><!-->
|
|
<script type="text/javascript">/*<![CDATA[*/var NS='syntax:ccmd';var JSINFO = {"updatable":1,"userreplace":1,"default_macro_string":"","plugins":{"edittable":{"default columnwidth":""}},"move_renameokay":false,"isadmin":0,"isauth":0,"bootstrap3":{"mode":"source","toc":[],"config":{"collapsibleSections":0,"fixedTopNavbar":1,"showSemanticPopup":0,"sidebarOnNavbar":0,"tagsOnTop":1,"tocAffix":1,"tocCollapseOnScroll":1,"tocCollapsed":0,"tocLayout":"default","useAnchorJS":1,"useAlternativeToolbarIcons":1}},"id":"syntax:ccmd:classic_for","namespace":"syntax:ccmd","ACT":"source","useHeadingNavigation":1,"useHeadingContent":1};
|
|
/*!]]>*/</script>
|
|
<script type="text/javascript" charset="utf-8" src="/web/20230326132808js_/https://wiki.bash-hackers.org/lib/exe/jquery.php?tseed=23f888679b4f1dc26eef34902aca964f"></script>
|
|
<script type="text/javascript" charset="utf-8" src="/web/20230326132808js_/https://wiki.bash-hackers.org/lib/exe/js.php?t=bootstrap3&tseed=54923c3deda180f2db5bd755cd8fbf1a"></script>
|
|
<script type="text/javascript">/*<![CDATA[*/if (typeof IconifyConfig == 'undefined') { var IconifyConfig = { 'defaultAPI' : '/lib/tpl/bootstrap3/iconify.php?prefix={prefix}&icons={icons}' } }
|
|
/*!]]>*/</script>
|
|
<script type="text/javascript" src="/web/20230326132808js_/https://wiki.bash-hackers.org/lib/tpl/bootstrap3/assets/bootstrap/js/bootstrap.min.js"></script>
|
|
<script type="text/javascript" src="/web/20230326132808js_/https://wiki.bash-hackers.org/lib/tpl/bootstrap3/assets/anchorjs/anchor.min.js"></script>
|
|
<script type="text/javascript" src="/web/20230326132808js_/https://wiki.bash-hackers.org/lib/tpl/bootstrap3/assets/typeahead/bootstrap3-typeahead.min.js"></script>
|
|
<script type="text/javascript" src="/web/20230326132808js_/https://wiki.bash-hackers.org/lib/tpl/bootstrap3/assets/iconify/iconify.min.js"></script>
|
|
<script type="text/javascript" src="/web/20230326132808js_/https://wiki.bash-hackers.org/lib/tpl/bootstrap3/assets/iconify/plugins/fa.js"></script>
|
|
<!--<![endif]-->
|
|
<style type="text/css">@media screen { body { margin-top: 65px; } #dw__toc.affix { top: 55px; position: fixed !important; } #dw__toc .nav .nav .nav { display: none; } }</style>
|
|
<!--[if lt IE 9]>
|
|
<script type="text/javascript" src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
|
|
<script type="text/javascript" src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
|
|
<![endif]-->
|
|
</head>
|
|
<body class="default dokuwiki mode_source tpl_bootstrap3 dw-page-on-panel dw-fluid-container" data-page-id="syntax:ccmd:classic_for"><div class="dokuwiki">
|
|
<header id="dokuwiki__header" class="dw-container dokuwiki container-fluid mx-5">
|
|
<!-- navbar -->
|
|
<nav id="dw__navbar" class="navbar navbar-fixed-top navbar-default" role="navigation">
|
|
|
|
<div class="dw-container container-fluid mx-5">
|
|
|
|
<div class="navbar-header">
|
|
|
|
<button class="navbar-toggle" type="button" data-toggle="collapse" data-target=".navbar-collapse">
|
|
<span class="icon-bar"></span>
|
|
<span class="icon-bar"></span>
|
|
<span class="icon-bar"></span>
|
|
</button>
|
|
|
|
<a class="navbar-brand d-flex align-items-center" href="/web/20230326132808/https://wiki.bash-hackers.org/start" accesskey="h" title="Bash Hackers Wiki"><img id="dw__logo" class="pull-left h-100 mr-4" alt="Bash Hackers Wiki" src="/web/20230326132808im_/https://wiki.bash-hackers.org/lib/tpl/bootstrap3/images/logo.png"/><div class="pull-right"><div id="dw__title">Bash Hackers Wiki</div></div></a>
|
|
</div>
|
|
|
|
<div class="collapse navbar-collapse">
|
|
|
|
|
|
|
|
|
|
<div class="navbar-right" id="dw__navbar_items">
|
|
|
|
|
|
<!-- navbar-searchform -->
|
|
<form action="/web/20230326132808/https://wiki.bash-hackers.org/syntax/ccmd/classic_for" accept-charset="utf-8" class="navbar-form navbar-left search" id="dw__search" method="get" role="search">
|
|
<div class="input-group">
|
|
<input id="qsearch" autocomplete="off" type="search" placeholder="Search" value="" accesskey="f" name="q" class="form-control" title="[F]"/>
|
|
<div class="input-group-btn">
|
|
<button class="btn btn-default" type="submit" title="Search">
|
|
<span class="iconify" data-icon="mdi:magnify"></span> </button>
|
|
</div>
|
|
|
|
</div>
|
|
<input type="hidden" name="do" value="search"/>
|
|
</form>
|
|
<!-- /navbar-searchform -->
|
|
<!-- tools-menu -->
|
|
<ul class="nav navbar-nav dw-action-icon" id="dw__tools">
|
|
|
|
|
|
<li class="dropdown">
|
|
|
|
<a href="" class="dropdown-toggle" data-target="#" data-toggle="dropdown" title="" role="button" aria-haspopup="true" aria-expanded="false">
|
|
<span class="iconify" data-icon="mdi:wrench"></span> <span class="hidden-lg hidden-md hidden-sm">Tools</span> <span class="caret"></span>
|
|
</a>
|
|
|
|
<ul class="dropdown-menu tools" role="menu">
|
|
|
|
<li class="dropdown-header">
|
|
<span class="iconify" data-icon="mdi:account"></span> User Tools </li>
|
|
|
|
<li class="action"><a href="/web/20230326132808/https://wiki.bash-hackers.org/syntax/ccmd/classic_for?do=register" title="Register" rel="nofollow" class="menuitem register"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewbox="0 0 24 24"><path d="M15 14c-2.67 0-8 1.33-8 4v2h16v-2c0-2.67-5.33-4-8-4m-9-4V7H4v3H1v2h3v3h2v-3h3v-2m6 2a4 4 0 0 0 4-4 4 4 0 0 0-4-4 4 4 0 0 0-4 4 4 4 0 0 0 4 4z"/></svg><span>Register</span></a></li><li class="action"><a href="/web/20230326132808/https://wiki.bash-hackers.org/syntax/ccmd/classic_for?do=login&sectok=" title="Log In" rel="nofollow" class="menuitem login"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewbox="0 0 24 24"><path d="M10 17.25V14H3v-4h7V6.75L15.25 12 10 17.25M8 2h9a2 2 0 0 1 2 2v16a2 2 0 0 1-2 2H8a2 2 0 0 1-2-2v-4h2v4h9V4H8v4H6V4a2 2 0 0 1 2-2z"/></svg><span>Log In</span></a></li>
|
|
<li class="divider" role="separator"></li>
|
|
|
|
|
|
<li class="dropdown-header">
|
|
<span class="iconify" data-icon="mdi:toolbox"></span> Site Tools </li>
|
|
|
|
<li class="action"><a href="/web/20230326132808/https://wiki.bash-hackers.org/syntax/ccmd/classic_for?do=recent" title="Recent Changes [r]" rel="nofollow" accesskey="r" class="menuitem recent"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewbox="0 0 24 24"><path d="M15 13h1.5v2.82l2.44 1.41-.75 1.3L15 16.69V13m4-5H5v11h4.67c-.43-.91-.67-1.93-.67-3a7 7 0 0 1 7-7c1.07 0 2.09.24 3 .67V8M5 21a2 2 0 0 1-2-2V5c0-1.11.89-2 2-2h1V1h2v2h8V1h2v2h1a2 2 0 0 1 2 2v6.1c1.24 1.26 2 2.99 2 4.9a7 7 0 0 1-7 7c-1.91 0-3.64-.76-4.9-2H5m11-9.85A4.85 4.85 0 0 0 11.15 16c0 2.68 2.17 4.85 4.85 4.85A4.85 4.85 0 0 0 20.85 16c0-2.68-2.17-4.85-4.85-4.85z"/></svg><span>Recent Changes</span></a></li><li class="action"><a href="/web/20230326132808/https://wiki.bash-hackers.org/syntax/ccmd/classic_for?do=media&ns=syntax%3Accmd" title="Media Manager" rel="nofollow" class="menuitem media"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewbox="0 0 24 24"><path d="M7 15l4.5-6 3.5 4.5 2.5-3L21 15m1-11h-8l-2-2H6a2 2 0 0 0-2 2v12a2 2 0 0 0 2 2h16a2 2 0 0 0 2-2V6a2 2 0 0 0-2-2M2 6H0v14a2 2 0 0 0 2 2h18v-2H2V6z"/></svg><span>Media Manager</span></a></li><li class="action"><a href="/web/20230326132808/https://wiki.bash-hackers.org/syntax/ccmd/classic_for?do=index" title="Sitemap [x]" rel="nofollow" accesskey="x" class="menuitem index"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewbox="0 0 24 24"><path d="M3 3h6v4H3V3m12 7h6v4h-6v-4m0 7h6v4h-6v-4m-2-4H7v5h6v2H5V9h2v2h6v2z"/></svg><span>Sitemap</span></a></li>
|
|
<li class="divider" role="separator"></li>
|
|
|
|
|
|
<li class="dropdown-header">
|
|
<span class="iconify" data-icon="mdi:file-document-outline"></span> Page Tools </li>
|
|
|
|
<li class="action"><a href="/web/20230326132808/https://wiki.bash-hackers.org/syntax/ccmd/classic_for?do=" title="Show page [v]" rel="nofollow" accesskey="v" class="menuitem show"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewbox="0 0 24 24"><path d="M13 9h5.5L13 3.5V9M6 2h8l6 6v12a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2V4c0-1.11.89-2 2-2m9 16v-2H6v2h9m3-4v-2H6v2h12z"/></svg><span>Show page</span></a></li><li class="action"><a href="/web/20230326132808/https://wiki.bash-hackers.org/syntax/ccmd/classic_for?do=revisions" title="Old revisions [o]" rel="nofollow" accesskey="o" class="menuitem revs"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewbox="0 0 24 24"><path d="M11 7v5.11l4.71 2.79.79-1.28-4-2.37V7m0-5C8.97 2 5.91 3.92 4.27 6.77L2 4.5V11h6.5L5.75 8.25C6.96 5.73 9.5 4 12.5 4a7.5 7.5 0 0 1 7.5 7.5 7.5 7.5 0 0 1-7.5 7.5c-3.27 0-6.03-2.09-7.06-5h-2.1c1.1 4.03 4.77 7 9.16 7 5.24 0 9.5-4.25 9.5-9.5A9.5 9.5 0 0 0 12.5 2z"/></svg><span>Old revisions</span></a></li><li class="action"><a href="/web/20230326132808/https://wiki.bash-hackers.org/syntax/ccmd/classic_for?do=backlink" title="Backlinks" rel="nofollow" class="menuitem backlink"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewbox="0 0 24 24"><path d="M10.59 13.41c.41.39.41 1.03 0 1.42-.39.39-1.03.39-1.42 0a5.003 5.003 0 0 1 0-7.07l3.54-3.54a5.003 5.003 0 0 1 7.07 0 5.003 5.003 0 0 1 0 7.07l-1.49 1.49c.01-.82-.12-1.64-.4-2.42l.47-.48a2.982 2.982 0 0 0 0-4.24 2.982 2.982 0 0 0-4.24 0l-3.53 3.53a2.982 2.982 0 0 0 0 4.24m2.82-4.24c.39-.39 1.03-.39 1.42 0a5.003 5.003 0 0 1 0 7.07l-3.54 3.54a5.003 5.003 0 0 1-7.07 0 5.003 5.003 0 0 1 0-7.07l1.49-1.49c-.01.82.12 1.64.4 2.43l-.47.47a2.982 2.982 0 0 0 0 4.24 2.982 2.982 0 0 0 4.24 0l3.53-3.53a2.982 2.982 0 0 0 0-4.24.973.973 0 0 1 0-1.42z"/></svg><span>Backlinks</span></a></li><li class="action"><a href="#dokuwiki__top" title="Back to top [t]" rel="nofollow" accesskey="t" class="menuitem top"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8v12z"/></svg><span>Back to top</span></a></li>
|
|
|
|
</ul>
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
<!-- /tools-menu -->
|
|
|
|
<ul class="nav navbar-nav">
|
|
|
|
|
|
<li>
|
|
<span class="dw__actions dw-action-icon">
|
|
<a href="/web/20230326132808/https://wiki.bash-hackers.org/syntax/ccmd/classic_for?do=register" title="Register" rel="nofollow" class="menuitem register btn btn-success navbar-btn"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewbox="0 0 24 24"><path d="M15 14c-2.67 0-8 1.33-8 4v2h16v-2c0-2.67-5.33-4-8-4m-9-4V7H4v3H1v2h3v3h2v-3h3v-2m6 2a4 4 0 0 0 4-4 4 4 0 0 0-4-4 4 4 0 0 0-4 4 4 4 0 0 0 4 4z"/></svg><span class=""> Register</span></a><a href="/web/20230326132808/https://wiki.bash-hackers.org/syntax/ccmd/classic_for?do=login&sectok=" title="Log In" rel="nofollow" class="menuitem login btn btn-default navbar-btn"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewbox="0 0 24 24"><path d="M10 17.25V14H3v-4h7V6.75L15.25 12 10 17.25M8 2h9a2 2 0 0 1 2 2v16a2 2 0 0 1-2 2H8a2 2 0 0 1-2-2v-4h2v4h9V4H8v4H6V4a2 2 0 0 1 2-2z"/></svg><span class=""> Log In</span></a> </span>
|
|
</li>
|
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
</div>
|
|
</div>
|
|
</nav>
|
|
<!-- navbar -->
|
|
<div align="center">
|
|
<script async src="//web.archive.org/web/20230326132808js_/https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
|
|
<!-- BHORG_BOTTOM -->
|
|
<ins class="adsbygoogle" style="display:inline-block;width:728px;height:90px" data-ad-client="ca-pub-4658830517838678" data-ad-slot="1603598940"></ins>
|
|
<script>
|
|
(adsbygoogle = window.adsbygoogle || []).push({});
|
|
</script>
|
|
</div>
|
|
|
|
</header>
|
|
|
|
<a name="dokuwiki__top" id="dokuwiki__top"></a>
|
|
|
|
<main role="main" class="dw-container pb-5 dokuwiki container-fluid mx-5">
|
|
|
|
<div id="dokuwiki__pageheader">
|
|
|
|
|
|
<!-- breadcrumbs -->
|
|
<nav id="dw__breadcrumbs" class="small">
|
|
|
|
<hr/>
|
|
|
|
<div class="dw__youarehere">
|
|
<ol class="breadcrumb" itemscope itemtype="http://schema.org/BreadcrumbList"><li>You are here</li><li itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem"><a href="/web/20230326132808/https://wiki.bash-hackers.org/start" itemprop="item" title="start"><span itemprop="name"><span class="iconify" data-icon="mdi:home"></span></span></a></li><li itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem"><a itemprop="item" href="/web/20230326132808/https://wiki.bash-hackers.org/syntax/start" class="wikilink1" title="syntax:start">Syntax</a></li><li itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem"><a itemprop="item" href="/web/20230326132808/https://wiki.bash-hackers.org/syntax/ccmd/start" class="wikilink1" title="syntax:ccmd:start">Compound Commands</a></li><li class="active" itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem"><span itemprop="name"><a itemprop="item" href="/web/20230326132808/https://wiki.bash-hackers.org/syntax/ccmd/classic_for" class="wikilink1" title="syntax:ccmd:classic_for">The classic for-loop</a></span></li></ol> </div>
|
|
|
|
<div class="dw__breadcrumbs hidden-print">
|
|
<ol class="breadcrumb"><li>Trace</li> </div>
|
|
|
|
<hr/>
|
|
|
|
</nav>
|
|
<!-- /breadcrumbs -->
|
|
|
|
<p class="text-right">
|
|
<span class="pageId ml-1 label label-primary">syntax:ccmd:classic_for</span> </p>
|
|
|
|
<div id="dw__msgarea" class="small">
|
|
</div>
|
|
|
|
</div>
|
|
|
|
<div class="row">
|
|
|
|
|
|
<article id="dokuwiki__content" class="col-sm-12 col-md-12 " itemscope itemtype="http://schema.org/Article" itemref="dw__license">
|
|
|
|
|
|
<!-- page-tools -->
|
|
<nav id="dw__pagetools" class="hidden-print">
|
|
<div class="tools panel panel-default">
|
|
<ul class="nav nav-stacked nav-pills text-muted">
|
|
<li class="action"><a href="/web/20230326132808/https://wiki.bash-hackers.org/syntax/ccmd/classic_for?do=" title="Show page [v]" rel="nofollow" accesskey="v" class="menuitem show"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewbox="0 0 24 24"><path d="M13 9h5.5L13 3.5V9M6 2h8l6 6v12a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2V4c0-1.11.89-2 2-2m9 16v-2H6v2h9m3-4v-2H6v2h12z"/></svg><span>Show page</span></a></li><li class="action"><a href="/web/20230326132808/https://wiki.bash-hackers.org/syntax/ccmd/classic_for?do=revisions" title="Old revisions [o]" rel="nofollow" accesskey="o" class="menuitem revs"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewbox="0 0 24 24"><path d="M11 7v5.11l4.71 2.79.79-1.28-4-2.37V7m0-5C8.97 2 5.91 3.92 4.27 6.77L2 4.5V11h6.5L5.75 8.25C6.96 5.73 9.5 4 12.5 4a7.5 7.5 0 0 1 7.5 7.5 7.5 7.5 0 0 1-7.5 7.5c-3.27 0-6.03-2.09-7.06-5h-2.1c1.1 4.03 4.77 7 9.16 7 5.24 0 9.5-4.25 9.5-9.5A9.5 9.5 0 0 0 12.5 2z"/></svg><span>Old revisions</span></a></li><li class="action"><a href="/web/20230326132808/https://wiki.bash-hackers.org/syntax/ccmd/classic_for?do=backlink" title="Backlinks" rel="nofollow" class="menuitem backlink"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewbox="0 0 24 24"><path d="M10.59 13.41c.41.39.41 1.03 0 1.42-.39.39-1.03.39-1.42 0a5.003 5.003 0 0 1 0-7.07l3.54-3.54a5.003 5.003 0 0 1 7.07 0 5.003 5.003 0 0 1 0 7.07l-1.49 1.49c.01-.82-.12-1.64-.4-2.42l.47-.48a2.982 2.982 0 0 0 0-4.24 2.982 2.982 0 0 0-4.24 0l-3.53 3.53a2.982 2.982 0 0 0 0 4.24m2.82-4.24c.39-.39 1.03-.39 1.42 0a5.003 5.003 0 0 1 0 7.07l-3.54 3.54a5.003 5.003 0 0 1-7.07 0 5.003 5.003 0 0 1 0-7.07l1.49-1.49c-.01.82.12 1.64.4 2.43l-.47.47a2.982 2.982 0 0 0 0 4.24 2.982 2.982 0 0 0 4.24 0l3.53-3.53a2.982 2.982 0 0 0 0-4.24.973.973 0 0 1 0-1.42z"/></svg><span>Backlinks</span></a></li><li class="action"><a href="#dokuwiki__top" title="Back to top [t]" rel="nofollow" accesskey="t" class="menuitem top"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8v12z"/></svg><span>Back to top</span></a></li> </ul>
|
|
</div>
|
|
</nav>
|
|
<!-- /page-tools -->
|
|
|
|
<div class="panel panel-default px-3 py-2" itemprop="articleBody">
|
|
<div class="page panel-body">
|
|
|
|
|
|
<div class="dw-content-page "><!-- content --><div class="dw-content"><p>
|
|
This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong.
|
|
</p>
|
|
<div class="editBox" role="application">
|
|
|
|
<div class="toolbar group">
|
|
<div id="draft__status" class="draft__status"></div>
|
|
<div id="tool__bar" class="tool__bar"></div>
|
|
</div>
|
|
<form id="dw__editform" method="post" action="" accept-charset="utf-8" class=" form-inline"><div class="no">
|
|
<input type="hidden" name="sectok" value=""/><input type="hidden" name="id" value="syntax:ccmd:classic_for"/><input type="hidden" name="rev" value="0"/><input type="hidden" name="date" value="0"/><input type="hidden" name="prefix" value="."/><input type="hidden" name="suffix" value=""/><input type="hidden" name="changecheck" value="4e5f016ee78c0c16b6decbe2518c8bf4"/><input type="hidden" name="target" value="section"/><textarea name="wikitext" id="wiki__text" dir="auto" class="edit form-control" cols="80" rows="10" tabindex="1" readonly="readonly">
|
|
====== The classic for-loop ======
|
|
|
|
===== Synopsis =====
|
|
<code>
|
|
for <NAME>; do
|
|
<LIST>
|
|
done
|
|
</code>
|
|
|
|
<code>
|
|
for <NAME> in <WORDS>; do
|
|
<LIST>
|
|
done
|
|
</code>
|
|
alternative, historical and undocumented syntax ((http://pubs.opengroup.org/onlinepubs/9699919799/xrat/V4_xcu_chap02.html#tag_23_02_09_12))
|
|
<code>
|
|
for <NAME>; {
|
|
<LIST>
|
|
}
|
|
|
|
for <NAME> in <WORDS>; {
|
|
<LIST>
|
|
}
|
|
|
|
</code>
|
|
|
|
===== Description =====
|
|
|
|
For every word in ''<WORDS>'', one iteration of the loop is performed and the variable ''<NAME>'' is set to the current word. If no "''in <WORDS>''" is present to give an own word-list, then the positional parameters (''"$@"'') are used (the arguments to the script or function). In this case (and only in this case), the semicolon between the variable name and the ''do'' is optional.
|
|
|
|
|
|
If you use the loop-variable inside the for-loop and it can contain spaces, you need to quote it, since normal word-splitting procedures apply.
|
|
|
|
|
|
:!: Like all loops (both ''for''-loops, ''while'' and ''until''), this loop can be
|
|
* terminated (broken) by the ''break'' command, optionally as ''break N'' to break ''N'' levels of nested loops
|
|
* forced to immediately do the next iteration using the ''continue'' command, optionally as ''continue N'' analog to ''break N''
|
|
|
|
Bash knows an alternative syntax for the ''for'' loop, enclosing the loop body in ''{<nowiki>...</nowiki>}'' instead of ''do <nowiki>...</nowiki> done'':
|
|
<code bash>
|
|
for x in 1 2 3
|
|
{
|
|
echo $x
|
|
}
|
|
</code>
|
|
This syntax is **not documented** and should not be used. I found the parser definitions for it in 1.x code, and in modern 4.x code. My guess is that it's there for compatiblity reasons. This syntax is not specified by POSIX(r).
|
|
|
|
|
|
==== Return status ====
|
|
|
|
The return status is the one of the last command executed in ''<LIST>'' or ''0'' (''TRUE''), if the item list ''<WORDS>'' evaluates to nothing (i.e.: "is empty"!).
|
|
|
|
|
|
===== Examples =====
|
|
==== Iterate over array elements ====
|
|
|
|
With some array syntax (see [[syntax:arrays]]) you can easily "feed" the for-loop to iterate over all elements in an array (by mass-expanding all elements):
|
|
<code bash>
|
|
for element in "${myarray[@]}"; do
|
|
echo "Element: $element"
|
|
done
|
|
</code>
|
|
|
|
Another way is to mass-expand all used indexes and access the array by index:
|
|
<code bash>
|
|
for index in "${!myarray[@]}"; do
|
|
echo "Element[$index]: ${myarray[$index]}"
|
|
done
|
|
</code>
|
|
|
|
==== List positional parameters ====
|
|
You can use this [[syntax:basicgrammar#shell_function_definitions | function]] to test how arguments to a command will be interpreted and parsed, and finally used:
|
|
<code bash>
|
|
argtest() {
|
|
n=1
|
|
for arg; do
|
|
echo "Argument $((n++)): \"$arg\""
|
|
done
|
|
}
|
|
</code>
|
|
|
|
|
|
==== Loop through a directory ====
|
|
Since pathname expansion will expand all filenames to separate words, regardless of spaces, you can use the for-loop to iterate through filenames in a directory:
|
|
<code bash>
|
|
for fn in *; do
|
|
if [ -h "$fn" ]; then
|
|
echo -n "Symlink: "
|
|
elif [ -d "$fn" ]; then
|
|
echo -n "Dir: "
|
|
elif [ -f "$fn" ]; then
|
|
echo -n "File: "
|
|
else
|
|
echo -n "Unknown: "
|
|
fi
|
|
echo "$fn"
|
|
done
|
|
</code>
|
|
Stupid example, I know ;-)
|
|
|
|
==== Loop over lines of output ====
|
|
|
|
To be complete: You can change the internal field separator (IFS) to a newline and thus make a for-loop iterating over lines instead of words:
|
|
|
|
<code bash>
|
|
IFS=$'\n'
|
|
for f in $(ls); do
|
|
echo $f
|
|
done
|
|
</code>
|
|
|
|
This is just an example. In //general//
|
|
* it's not a good idea to parse ''ls(1)'' output
|
|
* the [[syntax:ccmd:while_loop|while loop]] (using the ''read'' command) is a better joice to iterate over lines
|
|
|
|
==== Nested for-loops ====
|
|
|
|
It's of course possible to use another for-loop as ''<LIST>''. Here, counting from 0 to 99 in a weird way:
|
|
|
|
<code bash>
|
|
for x in 0 1 2 3 4 5 6 7 8 9; do
|
|
for y in 0 1 2 3 4 5 6 7 8 9; do
|
|
echo $x$y
|
|
done
|
|
done
|
|
</code>
|
|
|
|
==== Loop over a number range ====
|
|
|
|
Beginning in Bash 4, you can also use "sequence expression" form of [[syntax:expansion:brace|brace expansion]] syntax when looping over numbers, and this form does not create leading zeroes unless you ask for them:
|
|
|
|
<code bash>
|
|
# 100 numbers, no leading zeroes
|
|
for x in {0..99}; do
|
|
echo $x
|
|
done
|
|
</code>
|
|
|
|
<code bash>
|
|
# Every other number, width 3
|
|
for x in {000..99..2}; do
|
|
echo $x
|
|
done
|
|
</code>
|
|
|
|
WARNING: the entire list is created before looping starts. If your list is huge this may be an issue, but no more so than for a glob that expands to a huge list.
|
|
|
|
===== Portability considerations =====
|
|
|
|
===== See also =====
|
|
|
|
* [[syntax:ccmd:c_for]]</textarea>
|
|
<div id="wiki__editbar" class="editBar">
|
|
<div id="size__ctl">
|
|
</div>
|
|
</div>
|
|
</div></form>
|
|
</div>
|
|
</div><!-- /content --></div>
|
|
</div>
|
|
</div>
|
|
|
|
<div class="small text-right">
|
|
|
|
<span class="docInfo">
|
|
<ul class="list-inline"><li><span class="iconify text-muted" data-icon="mdi:file-document-outline"></span> <span title="syntax/ccmd/classic_for.txt">syntax/ccmd/classic_for.txt</span></li><li><span class="iconify text-muted" data-icon="mdi:calendar"></span> Last modified: <span title="2017/01/19 21:02">2017/01/19 21:02</span></li><li class="text-muted">by <bdi>4dummies</bdi></li></ul> </span>
|
|
|
|
|
|
</div>
|
|
|
|
</article>
|
|
|
|
|
|
</div>
|
|
|
|
</main>
|
|
|
|
<footer id="dw__footer" class="dw-container py-5 dokuwiki container-fluid">
|
|
<hr/>
|
|
<div align="center">
|
|
<h3><a target="_blank" href="http://web.archive.org/web/20230326132808/http://www.performing-databases.com/">This site is supported by Performing Databases - your experts for database administration</a></h3>
|
|
</div>
|
|
<hr/>
|
|
<div align="center">
|
|
<script async src="//web.archive.org/web/20230326132808js_/https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
|
|
<!-- BHORG_BOTTOM -->
|
|
<ins class="adsbygoogle" style="display:inline-block;width:728px;height:90px" data-ad-client="ca-pub-4658830517838678" data-ad-slot="1603598940"></ins>
|
|
<script>
|
|
(adsbygoogle = window.adsbygoogle || []).push({});
|
|
</script>
|
|
</div>
|
|
|
|
<!-- footer -->
|
|
<div class="dw-container small container-fluid mx-5">
|
|
|
|
|
|
<div class="footer-dw-title">
|
|
<div class="media">
|
|
<div class="media-left">
|
|
<img src="/web/20230326132808im_/https://wiki.bash-hackers.org/lib/tpl/bootstrap3/images/logo.png" alt="Bash Hackers Wiki" class="media-object" style="height:32px"/>
|
|
</div>
|
|
<div class="media-body">
|
|
<div class="row">
|
|
<div class="col-sm-2">
|
|
<h4 class="media-heading">Bash Hackers Wiki</h4>
|
|
<p>
|
|
</p>
|
|
</div>
|
|
<div class="col-sm-10">
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
<div class="footer-license row">
|
|
<hr/>
|
|
<div id="dw__license" class="col-sm-6">
|
|
<p>
|
|
<a href="http://web.archive.org/web/20230326132808/http://www.gnu.org/licenses/fdl-1.3.html" title="GNU Free Documentation License 1.3" target="" itemscope itemtype="http://schema.org/CreativeWork" itemprop="license" rel="license" class="license"><img src="/web/20230326132808im_/https://wiki.bash-hackers.org/lib/tpl/bootstrap3/images/license/gnufdl.png" width="24" height="24" alt="gnufdl"/> </a> </p>
|
|
<p class="small">
|
|
Except where otherwise noted, content on this wiki is licensed under the following license:<br/><a href="http://web.archive.org/web/20230326132808/http://www.gnu.org/licenses/fdl-1.3.html" title="GNU Free Documentation License 1.3" target="" itemscope itemtype="http://schema.org/CreativeWork" itemprop="license" rel="license" class="license">GNU Free Documentation License 1.3</a> </p>
|
|
</div>
|
|
|
|
<div class="col-sm-6">
|
|
</div>
|
|
|
|
</div>
|
|
|
|
</div>
|
|
<!-- /footer -->
|
|
</footer>
|
|
|
|
<a href="#dokuwiki__top" class="back-to-top hidden-print btn btn-default" title="skip to content" accesskey="t">
|
|
<span class="iconify" data-icon="mdi:chevron-up"></span> </a>
|
|
|
|
<div id="screen__mode"> <span class="visible-xs-block"></span>
|
|
<span class="visible-sm-block"></span>
|
|
<span class="visible-md-block"></span>
|
|
<span class="visible-lg-block"></span>
|
|
</div>
|
|
|
|
<img src="/web/20230326132808im_/https://wiki.bash-hackers.org/lib/exe/indexer.php?id=syntax%3Accmd%3Aclassic_for&1679837291" width="2" height="1" alt=""/>
|
|
</div>
|
|
|
|
</body>
|
|
</html>
|
|
<!--
|
|
FILE ARCHIVED ON 13:28:08 Mar 26, 2023 AND RETRIEVED FROM THE
|
|
INTERNET ARCHIVE ON 11:36:28 Apr 14, 2023.
|
|
JAVASCRIPT APPENDED BY WAYBACK MACHINE, COPYRIGHT INTERNET ARCHIVE.
|
|
|
|
ALL OTHER CONTENT MAY ALSO BE PROTECTED BY COPYRIGHT (17 U.S.C.
|
|
SECTION 108(a)(3)).
|
|
-->
|
|
<!--
|
|
playback timings (ms):
|
|
captures_list: 108.306
|
|
exclusion.robots: 0.103
|
|
exclusion.robots.policy: 0.095
|
|
RedisCDXSource: 0.976
|
|
esindex: 0.006
|
|
LoadShardBlock: 89.121 (3)
|
|
PetaboxLoader3.datanode: 130.049 (4)
|
|
load_resource: 198.818
|
|
PetaboxLoader3.resolve: 149.114
|
|
--> |