lprng-doc 3.8.A~rc2-3 / usr / share / doc / lprng-doc / LPRng-Reference-Multipart / x3376.htm

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  <title>Printing from lpr Directly To A Device</title>
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<body class="SECT1" bgcolor="#FFFFFF" text="#000000" link="#0000FF"
vlink="#840084" alink="#0000FF">
  <div class="NAVHEADER">
    <table summary="Header navigation table" width="100%" border=
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      <tr>
        <th colspan="3" align="center">LPRng Reference Manual: 24
        Sep 2004 (For LPRng-3.8.28)</th>
      </tr>

      <tr>
        <td width="10%" align="left" valign="bottom"><a href=
        "x3273.htm" accesskey="P">Prev</a></td>

        <td width="80%" align="center" valign="bottom">Chapter 4.
        Print Spooling Tutorial</td>

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  </div>

  <div class="SECT1">
    <h1 class="SECT1"><a name="AEN3376" id="AEN3376">4.13. Printing
    from <b class="APPLICATION">lpr</b> Directly To A
    Device</a></h1>

    <p>While the most reliable way to print is to send jobs to a
    print spooler, sometimes it is desirable to print directly to a
    printer. This method is supported by the special <tt class=
    "LITERAL">:direct</tt> printcap flag or the <b class=
    "APPLICATION">lpr</b> <tt class="LITERAL">-Y</tt> command line
    flag. The following shows the effects of this flag:</p>

    <div class="INFORMALEXAMPLE">
      <a name="AEN3383" id="AEN3383"></a>
      <pre class="SCREEN">
lpr -Y -Phost%port file1 file2 ...
Eqivalent to:
  ( for i in file1 file2 ... ; do
    $filter $i
  done ) | tcpip_connection( host%port)

lpr -Y -P/dev/lp file1 file2 ...
Eqivalent to:
  ( for i in file1 file2 ... ; do
    $filter $i
  done ) &gt;&gt;/dev/lp

lpr -Y -P '|/program' file1 file2 ...
Eqivalent to:
  ( for i in file1 file2 ... ; do
    $filter $i
  done ) | /program
</pre>
    </div>

    <p>The above examples show how we can use the command line
    options to send files directly to a printer. You can also
    create a printcap that will do the same:</p>

    <div class="INFORMALEXAMPLE">
      <a name="AEN3386" id="AEN3386"></a>
      <pre class="SCREEN">
lp:direct:lp=/tmp/a:remote_support=R
Command:
  lpr -Plp file1 file2 ...
Equivalent to:
lpr -P/tmp/a -Y file1 file2 ...

Example:
<samp class="PROMPT">h4: {228} % </samp><kbd class=
"USERINPUT">lp -P/tmp/a /tmp/hi</kbd>
<samp class="PROMPT">h4: {229} % </samp><kbd class=
"USERINPUT">cat /tmp/a /tmp/hi</kbd>
hi
<samp class="PROMPT">h4: {230} % </samp><kbd class=
"USERINPUT">lp -Plp /tmp/hi</kbd>
<samp class="PROMPT">h4: {231} % </samp><kbd class=
"USERINPUT">cat /tmp/a /tmp/hi</kbd>
hi
hi
</pre>
    </div>

    <p>The <b class="APPLICATION">lpr</b> <tt class="LITERAL">-X
    filter</tt> option allows us to specify a user filter on the
    command line. We will use a simple example to show how this
    capability could be used in practice. Create the <tt class=
    "FILENAME">/tmp/pass</tt> file with the following contents, and
    give it executable permissions as shown below:</p>

    <div class="INFORMALEXAMPLE">
      <a name="AEN3400" id="AEN3400"></a>
      <pre class="SCREEN">
#!/bin/sh
# /tmp/pass file
echo LEADER
cat
echo TRAILER
exit 0
</pre>
    </div>

    <p>Execute the following commands to print the <tt class=
    "FILENAME">/tmp/hi</tt> file and observe the results:</p>

    <div class="INFORMALEXAMPLE">
      <a name="AEN3404" id="AEN3404"></a>
      <pre class="SCREEN">
<samp class="PROMPT">h4: {232} % </samp><kbd class=
"USERINPUT">cp /dev/null /tmp/a</kbd>
<samp class="PROMPT">h4: {233} % </samp><kbd class=
"USERINPUT">lpr -P/tmp/a -X /tmp/pass /tmp/hi</kbd>
<samp class="PROMPT">h4: {234} % </samp><kbd class=
"USERINPUT">cat /tmp/a</kbd>
LEADER
hi
TRAILER
</pre>
    </div>

    <p>As we see from the example, our filter has processed the
    input file and added the <tt class="LITERAL">LEADER</tt> and
    <tt class="LITERAL">TRAILER</tt> strings. In practice, the
    actual processing of the input job would be far more elaborate,
    and may do such things as incorporate files or other material
    available only on the local system. We can also use a printcap
    entry:</p>

    <div class="INFORMALEXAMPLE">
      <a name="AEN3415" id="AEN3415"></a>
      <pre class="SCREEN">
lp:direct:lp=/tmp/a:filter=/tmp/pass

<samp class="PROMPT">h4: {235} % </samp><kbd class=
"USERINPUT">cp /dev/null /tmp/a</kbd>
<samp class="PROMPT">h4: {236} % </samp><kbd class=
"USERINPUT">lpr -Plp /tmp/hi</kbd>
<samp class="PROMPT">h4: {237} % </samp><kbd class=
"USERINPUT">cat /tmp/a</kbd>
LEADER
hi
TRAILER
</pre>
    </div>
  </div>

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        <td width="33%" align="left" valign="top">Banner Printing
        and the OF filter</td>

        <td width="34%" align="center" valign="top"><a href=
        "tutorial.htm" accesskey="U">Up</a></td>

        <td width="33%" align="right" valign="top">Moving Jobs From
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