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<title>Filling (The GNU Troff Manual)</title>
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<h4 class="subsection" id="Filling-1">5.1.1 Filling</h4>
<p>When GNU <code class="code">troff</code> starts up, it obtains information about the device
for which it is preparing output.<a class="footnote" id="DOCF18" href="groff.html_fot.html#FOOT18"><sup>18</sup></a> An essential property is the length of the output
line, such as “6.5 inches”.
</p>
<a class="index-entry-id" id="index-word_002c-definition-of"></a>
<a class="index-entry-id" id="index-filling"></a>
<p>GNU <code class="code">troff</code> interprets plain text files employing the Unix
line-ending convention. It reads input a character at a time,
collecting words as it goes, and fits as many words together on an
output line as it can—this is known as <em class="dfn">filling</em>. To GNU
<code class="code">troff</code>, a <em class="dfn">word</em> is any sequence of one or more characters
that aren’t spaces or newlines. The exceptions separate
words.<a class="footnote" id="DOCF19" href="groff.html_fot.html#FOOT19"><sup>19</sup></a> To disable filling, see
<a class="ref" href="Manipulating-Filling-and-Adjustment.html">Manipulating Filling and Adjustment</a>.
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<div class="example">
<div class="group"><pre class="example-preformatted">It is a truth universally acknowledged
that a single man in possession of a
good fortune must be in want of a wife.
⇒ It is a truth universally acknowledged that a
⇒ single man in possession of a good fortune must
⇒ be in want of a wife.
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