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<div class="section" id="knife-xargs">
<h1>knife xargs<a class="headerlink" href="#knife-xargs" title="Permalink to this headline">¶</a></h1>
<p>The <strong>knife xargs</strong> subcommand is used to take patterns from standard input, download as JSON, run a command against the downloaded JSON, and then upload any changes.</p>
<div class="section" id="syntax">
<h2>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline">¶</a></h2>
<p>This subcommand has the following syntax:</p>
<div class="highlight-bash"><div class="highlight"><pre><span class="nv">$ </span>knife xargs <span class="o">[</span>PATTERN...<span class="o">]</span> <span class="o">(</span>options<span class="o">)</span>
</pre></div>
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</div>
<div class="section" id="options">
<h2>Options<a class="headerlink" href="#options" title="Permalink to this headline">¶</a></h2>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Review the list of <a class="reference internal" href="knife_common_options.html"><em>common options</em></a> available to this (and all) knife subcommands and plugins.</p>
</div>
<p>This subcommand has the following options:</p>
<dl class="docutils">
<dt><tt class="docutils literal"><span class="pre">-0</span></tt></dt>
<dd>Use to show a <tt class="docutils literal"><span class="pre">NULL</span></tt> character (<tt class="docutils literal"><span class="pre">\0</span></tt>) instead of white space as the separator. Default: <tt class="docutils literal"><span class="pre">false</span></tt>.</dd>
<dt><tt class="docutils literal"><span class="pre">--chef-repo-path</span> <span class="pre">PATH</span></tt></dt>
<dd>The path to the chef-repo. This setting will override the default path to the chef-repo. Default: same value as specified by <tt class="docutils literal"><span class="pre">chef_repo_path</span></tt> in client.rb.</dd>
<dt><tt class="docutils literal"><span class="pre">--concurrency</span></tt></dt>
<dd>The number of allowed concurrent connections. Default: <tt class="docutils literal"><span class="pre">10</span></tt>.</dd>
<dt><tt class="docutils literal"><span class="pre">--[no-]diff</span></tt></dt>
<dd>Use to show a diff when a file changes. Default: <tt class="docutils literal"><span class="pre">--diff</span></tt>.</dd>
<dt><tt class="docutils literal"><span class="pre">--dry-run</span></tt></dt>
<dd>Use to prevent changes from being uploaded to the Chef server. Default: <tt class="docutils literal"><span class="pre">false</span></tt>.</dd>
<dt><tt class="docutils literal"><span class="pre">--[no-]force</span></tt></dt>
<dd>Use to force the upload of files even if they haven’t been changed. Default: <tt class="docutils literal"><span class="pre">--no-force</span></tt>.</dd>
<dt><tt class="docutils literal"><span class="pre">-I</span> <span class="pre">REPLACE_STRING</span></tt>, <tt class="docutils literal"><span class="pre">--replace</span> <span class="pre">REPLACE_STRING</span></tt></dt>
<dd>Use to define a string that will be used to replace all occurrences of a file name. Default: <tt class="docutils literal"><span class="pre">nil</span></tt>.</dd>
<dt><tt class="docutils literal"><span class="pre">-J</span> <span class="pre">REPLACE_STRING</span></tt>, <tt class="docutils literal"><span class="pre">--replace-first</span> <span class="pre">REPLACE_STRING</span></tt></dt>
<dd>Use to define a string that will be used to replace the first occurrence of a file name. Default: <tt class="docutils literal"><span class="pre">nil</span></tt>.</dd>
<dt><tt class="docutils literal"><span class="pre">--local</span></tt></dt>
<dd>Use to build or execute a command line against a local file. Set to <tt class="docutils literal"><span class="pre">false</span></tt> to build or execute against a remote file. Default: <tt class="docutils literal"><span class="pre">false</span></tt>.</dd>
<dt><tt class="docutils literal"><span class="pre">-n</span> <span class="pre">MAX_ARGS</span></tt>, <tt class="docutils literal"><span class="pre">--max-args</span> <span class="pre">MAX_ARGS</span></tt></dt>
<dd>The maximum number of arguments per command line. Default: <tt class="docutils literal"><span class="pre">nil</span></tt>.</dd>
<dt><tt class="docutils literal"><span class="pre">-p</span> <span class="pre">[PATTERN...]</span></tt>, <tt class="docutils literal"><span class="pre">--pattern</span> <span class="pre">[PATTERN...]</span></tt></dt>
<dd>One (or more) patterns for a command line. If this option is not specified, a list of patterns may be expected on standard input. Default: <tt class="docutils literal"><span class="pre">nil</span></tt>.</dd>
<dt><tt class="docutils literal"><span class="pre">--repo-mode</span> <span class="pre">MODE</span></tt></dt>
<dd>The layout of the local chef-repo. Possible values: <tt class="docutils literal"><span class="pre">static</span></tt>, <tt class="docutils literal"><span class="pre">everything</span></tt>, or <tt class="docutils literal"><span class="pre">hosted_everything</span></tt>. Use <tt class="docutils literal"><span class="pre">static</span></tt> for just roles, environments, cookbooks, and data bags. By default, <tt class="docutils literal"><span class="pre">everything</span></tt> and <tt class="docutils literal"><span class="pre">hosted_everything</span></tt> are dynamically selected depending on the server type. Default value: <tt class="docutils literal"><span class="pre">default</span></tt>.</dd>
<dt><tt class="docutils literal"><span class="pre">-s</span> <span class="pre">LENGTH</span></tt>, <tt class="docutils literal"><span class="pre">--max-chars</span> <span class="pre">LENGTH</span></tt></dt>
<dd>The maximum size (in characters) for a command line. Default: <tt class="docutils literal"><span class="pre">nil</span></tt>.</dd>
<dt><tt class="docutils literal"><span class="pre">-t</span></tt></dt>
<dd>Use to run the print command on the command line. Default: <tt class="docutils literal"><span class="pre">nil</span></tt>.</dd>
</dl>
</div>
<div class="section" id="examples">
<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2>
<p>The following examples show how to use this knife subcommand:</p>
<p><strong>Use output of knife deps to pass command to knife xargs</strong></p>
<p>The following examples show various ways of listing all nodes on the server, and then using Perl to replace <tt class="docutils literal"><span class="pre">grantmc</span></tt> with <tt class="docutils literal"><span class="pre">gmc</span></tt>:</p>
<div class="highlight-bash"><div class="highlight"><pre><span class="nv">$ </span>knife list <span class="s1">'nodes/*'</span> | knife xargs <span class="s2">"perl -i -pe 's/grantmc/gmc'"</span>
</pre></div>
</div>
<p>or without quotes and the backslash escaped:</p>
<div class="highlight-bash"><div class="highlight"><pre><span class="nv">$ </span>knife list /nodes/<span class="se">\*</span> | knife xargs <span class="s2">"perl -i -pe 's/grantmc/gmc'"</span>
</pre></div>
</div>
<p>or by using the <tt class="docutils literal"><span class="pre">--pattern</span></tt> option:</p>
<div class="highlight-bash"><div class="highlight"><pre><span class="nv">$ </span>knife xargs --pattern <span class="s1">'/nodes.*'</span> <span class="s2">"perl -i -pe 's/grantmc/gmc'"</span>
</pre></div>
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