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<dd>
<pre>
<tt>di</tt><b>[</b><tt>scard</tt><b>] [</b><i>header-field</i><tt>...</tt><b>]</b><tt>ig</tt><b>[</b><tt>nore</tt><b>] [</b><i>header-field</i><tt>...</tt><b>]</b>
</pre>
</dd>
</dl>

<p>Suppress the specified header fields when writing messages. Specified <i>header-fields</i> shall be added to the list of
suppressed header fields. Examples of header fields to ignore are <b>status</b> and <b>cc</b>. The fields shall be included when
the message is saved. The <b>Print</b> and <b>Type</b> commands shall override this command. The comparison of header fields shall
be in a case-insensitive manner. If no arguments are specified, write a list of the currently suppressed header fields to standard
output; the listing need not reflect the same order of header fields that were entered.</p>

<p>If both <b>retain</b> and <b>discard</b> commands are given, <b>discard</b> commands shall be ignored.</p>

<h5><a name="tag_04_83_13_10"></a>Delete Messages and Display</h5>

<dl compact>
<dt><i>Synopsis</i>:</dt>

<dd>
<pre>
<tt>dp</tt> <b>[</b><i>msglist</i><b>]</b><tt>dt</tt> <b>[</b><i>msglist</i><b>]</b>
</pre>
</dd>
</dl>

<p>Delete the specified messages as described for the <b>delete</b> command, except that the <b>autoprint</b> variable shall have
no effect, and the current message shall be written only if it was set to a message after the last message deleted by the command.
Otherwise, an informational message to the effect that there are no further messages in the mailbox shall be written, followed by
the <i>mailx</i> prompt.</p>

<h5><a name="tag_04_83_13_11"></a>Echo a String</h5>

<dl compact>
<dt><i>Synopsis</i>:</dt>

<dd>
<pre>
<tt>ec</tt><b>[</b><tt>ho</tt><b>]</b> <i>string</i> <tt>...
</tt>
</pre>
</dd>
</dl>

<p>Echo the given strings, equivalent to the shell <a href="../utilities/echo.html"><i>echo</i></a> utility.</p>

<h5><a name="tag_04_83_13_12"></a>Edit Messages</h5>

<dl compact>
<dt><i>Synopsis</i>:</dt>

<dd>
<pre>
<tt>e</tt><b>[</b><tt>dit</tt><b>] [</b><i>msglist</i><b>]</b>
</pre>
</dd>
</dl>

<p>Edit the given messages. The messages shall be placed in a temporary file and the utility named by the <i>EDITOR</i> variable is
invoked to edit each file in sequence. The default <i>EDITOR</i> is unspecified.</p>

<p>The <b>edit</b> command does not modify the contents of those messages in the mailbox.</p>

<h5><a name="tag_04_83_13_13"></a>Exit</h5>

<dl compact>
<dt><i>Synopsis</i>:</dt>

<dd>
<pre>
<tt>ex</tt><b>[</b><tt>it</tt><b>]</b><tt>x</tt><b>[</b><tt>it</tt><b>]</b>
</pre>
</dd>
</dl>

<p>Exit from <i>mailx</i> without changing the mailbox. No messages shall be saved in the <b>mbox</b> (see also <b>quit</b>).</p>

<h5><a name="tag_04_83_13_14"></a>Change Folder</h5>

<dl compact>
<dt><i>Synopsis</i>:</dt>

<dd>
<pre>
<tt>fi</tt><b>[</b><tt>le</tt><b>] [</b><i>file</i><b>]</b><tt>fold</tt><b>[</b><tt>er</tt><b>] [</b><i>file</i><b>]</b>
</pre>
</dd>
</dl>

<p>Quit (see the <b>quit</b> command) from the current file of messages and read in the file named by the pathname <i>file</i>. If
no argument is given, the name and status of the current mailbox shall be written.</p>

<p>Several unquoted special characters shall be recognized when used as <i>file</i> names, with the following substitutions:</p>

<dl compact>
<dt><tt>%</tt></dt>

<dd>The system mailbox for the invoking user.</dd>

<dt><tt>%</tt><i>user</i></dt>

<dd>The system mailbox for <i>user</i>.</dd>

<dt><tt>#</tt></dt>

<dd>The previous file.</dd>

<dt><tt>&amp;</tt></dt>

<dd>The current <b>mbox</b>.</dd>

<dt><tt>+</tt><i>file</i></dt>

<dd>The named file in the <b>folder</b> directory. (See the <b>folder</b> variable.)</dd>
</dl>

<p>The default file shall be the current mailbox.</p>

<h5><a name="tag_04_83_13_15"></a>Display List of Folders</h5>

<dl compact>
<dt><i>Synopsis</i>:</dt>

<dd>
<pre>
<tt>folders</tt>
</pre>
</dd>
</dl>

<p>Write the names of the files in the directory set by the <b>folder</b> variable. The command specified by the <i>LISTER</i>
environment variable shall be used (see the ENVIRONMENT VARIABLES section).</p>

<h5><a name="tag_04_83_13_16"></a>Follow Up Specified Messages</h5>

<dl compact>
<dt><i>Synopsis</i>:</dt>

<dd>
<pre>
<tt>fo</tt><b>[</b><tt>llowup</tt><b>] [</b><i>message</i><b>]</b><tt>F</tt><b>[</b><tt>ollowup</tt><b>] [</b><i>msglist</i><b>]</b>
</pre>
</dd>
</dl>

<p>In the lowercase form, respond to a message, recording the response in a file whose name is derived from the author of the
message. See also the <b>save</b> and <b>copy</b> commands and <b>outfolder</b>.</p>

<p>In the capitalized form, respond to the first message in the <i>msglist</i>, sending the message to the author of each message
in the <i>msglist</i>. The subject line shall be taken from the first message and the response shall be recorded in a file whose
name is derived from the author of the first message. See also the <b>Save</b> and <b>Copy</b> commands and <b>outfolder</b>.</p>

<p>Both forms shall override the <b>record</b> variable, if set.</p>

<h5><a name="tag_04_83_13_17"></a>Display Header Summary for Specified Messages</h5>

<dl compact>
<dt><i>Synopsis</i>:</dt>

<dd>
<pre>
<tt>f</tt><b>[</b><tt>rom</tt><b>] [</b><i>msglist</i><b>]</b>
</pre>
</dd>
</dl>

<p>Write the header summary for the specified messages.</p>

<h5><a name="tag_04_83_13_18"></a>Display Header Summary</h5>

<dl compact>
<dt><i>Synopsis</i>:</dt>

<dd>
<pre>
<tt>h</tt><b>[</b><tt>eaders</tt><b>] [</b><i>message</i><b>]</b>
</pre>
</dd>
</dl>

<p>Write the page of headers that includes the message specified. If the <i>message</i> argument is not specified, the current
message shall not change. However, if the <i>message</i> argument is specified, the current message shall become the message that
appears at the top of the page of headers that includes the message specified. The <b>screen</b> variable sets the number of
headers per page. See also the <b>z</b> command.</p>

<h5><a name="tag_04_83_13_19"></a>Help</h5>

<dl compact>
<dt><i>Synopsis</i>:</dt>

<dd>
<pre>
<tt>hel</tt><b>[</b><tt>p</tt><b>]</b><tt>?
</tt>
</pre>
</dd>
</dl>

<p>Write a summary of commands.</p>

<h5><a name="tag_04_83_13_20"></a>Hold Messages</h5>

<dl compact>
<dt><i>Synopsis</i>:</dt>

<dd>
<pre>
<tt>ho</tt><b>[</b><tt>ld</tt><b>] [</b><i>msglist</i><b>]</b><tt>pre</tt><b>[</b><tt>serve</tt><b>] [</b><i>msglist</i><b>]</b>
</pre>
</dd>
</dl>

<p>Mark the messages in <i>msglist</i> to be retained in the mailbox when <i>mailx</i> terminates. This shall override any commands
that might previously have marked the messages to be deleted. During the current invocation of <i>mailx</i>, only the
<b>delete</b>, <b>dp</b>, or <b>dt</b> commands shall remove the <i>preserve</i> marking of a message.</p>

<h5><a name="tag_04_83_13_21"></a>Execute Commands Conditionally</h5>

<dl compact>
<dt><i>Synopsis</i>:</dt>

<dd>
<pre>
<tt>i</tt><b>[</b><tt>f</tt><b>]</b> <tt>s|r
</tt><i>mail-command</i><tt>s
el</tt><b>[</b><tt>se</tt><b>]
</b><i>mail-command</i><tt>s
en</tt><b>[</b><tt>dif</tt><b>]</b>
</pre>
</dd>
</dl>

<p>Execute commands conditionally, where <b>if&nbsp;s</b> executes the following <i>mail-command</i>s, up to an <b>else</b> or
<b>endif</b>, if the program is in Send Mode, and <b>if&nbsp;r</b> shall cause the <i>mail-command</i>s to be executed only in
Receive Mode.</p>

<h5><a name="tag_04_83_13_22"></a>List Available Commands</h5>

<dl compact>
<dt><i>Synopsis</i>:</dt>

<dd>
<pre>
<tt>l</tt><b>[</b><tt>ist</tt><b>]</b>
</pre>
</dd>
</dl>

<p>Write a list of all commands available. No explanation shall be given.</p>

<h5><a name="tag_04_83_13_23"></a>Mail a Message</h5>

<dl compact>
<dt><i>Synopsis</i>:</dt>

<dd>
<pre>
<tt>m</tt><b>[</b><tt>ail</tt><b>]</b> <i>address</i><tt>...
</tt>
</pre>
</dd>
</dl>

<p>Mail a message to the specified addresses or aliases.</p>

<h5><a name="tag_04_83_13_24"></a>Direct Messages to mbox</h5>

<dl compact>
<dt><i>Synopsis</i>:</dt>

<dd>
<pre>
<tt>mb</tt><b>[</b><tt>ox</tt><b>] [</b><i>msglist</i><b>]</b>
</pre>
</dd>
</dl>

<p>Arrange for the given messages to end up in the <b>mbox</b> save file when <i>mailx</i> terminates normally. See <i>MBOX .</i>
See also the <b>exit</b> and <b>quit</b> commands.</p>

<h5><a name="tag_04_83_13_25"></a>Process Next Specified Message</h5>

<dl compact>
<dt><i>Synopsis</i>:</dt>

<dd>
<pre>
<tt>n</tt><b>[</b><tt>ext</tt><b>] [</b><i>message</i><b>]</b>
</pre>
</dd>
</dl>

<p>If the current message has not been written (for example, by the <b>print</b> command) since <i>mailx</i> started or since any
other message was the current message, behave as if the <b>print</b> command was entered. Otherwise, if there is an undeleted
message after the current message, make it the current message and behave as if the <b>print</b> command was entered. Otherwise, an
informational message to the effect that there are no further messages in the mailbox shall be written, followed by the
<i>mailx</i> prompt.</p>

<h5><a name="tag_04_83_13_26"></a>Pipe Message</h5>

<dl compact>
<dt><i>Synopsis</i>:</dt>

<dd>
<pre>
<tt>pi</tt><b>[</b><tt>pe</tt><b>] [[</b><i>msglist</i><b>]</b> <i>command</i><b>]</b><tt>|</tt> <b>[[</b><i>msglist</i><b>]</b> <i>command</i><b>]</b>
</pre>
</dd>
</dl>

<p>Pipe the messages through the given <i>command</i> by invoking the command interpreter specified by <i>SHELL</i> with two
arguments: <b>-c</b> and <i>command</i>. (See also <a href="../utilities/sh.html"><i>sh</i></a> <b>-c</b>.) The application shall
ensure that the command is given as a single argument. Quoting, described previously, can be used to accomplish this. If no
arguments are given, the current message shall be piped through the command specified by the value of the <b>cmd</b> variable. If
the <b>page</b> variable is set, a &lt;form-feed&gt; shall be inserted after each message.</p>