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<title>Line Continuation (The GNU Troff Manual)</title>
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<div class="section-level-extent" id="Line-Continuation">
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<h3 class="section" id="Line-Continuation-1">5.16 Line Continuation</h3>
<a class="index-entry-id" id="index-line-control"></a>
<a class="index-entry-id" id="index-control_002c-line"></a>
<p>When filling is enabled, input and output line breaks generally do not
correspond. The <code class="code">roff</code> language therefore distinguishes input and
output line continuation.
</p>
<dl class="first-deffn">
<dt class="deffn" id="index-_005cRET-1"><span class="category-def">Escape sequence: </span><span><strong class="def-name"><code class="t">\<kbd class="key">RET</kbd></code><span class="r"><i class="slanted"></i></span><code class="t"></code></strong><a class="copiable-link" href='#index-_005cRET-1'> ¶</a></span></dt>
<dd><a class="index-entry-id" id="index-_005cRET"></a>
<a class="index-entry-id" id="index-input-line-continuation-_0028_005cRET_0029"></a>
<a class="index-entry-id" id="index-line_002c-input_002c-continuation-_0028_005cRET_0029"></a>
<a class="index-entry-id" id="index-continuation_002c-input-line-_0028_005cRET_0029"></a>
<a class="index-entry-id" id="index-_005cnewline"></a>
<p><code class="code">\<kbd class="key">RET</kbd></code> (a backslash immediately followed by a newline)
suppresses the effects of that newline in the input. The next input
line thus retains the classification of its predecessor as a control or
text line. <code class="code">\<kbd class="key">RET</kbd></code> is useful for managing line lengths in the
input during document maintenance; you can break an input line in the
middle of a request invocation, macro call, or escape sequence. Input
line continuation is invisible to the formatter, with two exceptions:
the <code class="code">|</code> operator recognizes the new input line
(see <a class="pxref" href="Numeric-Expressions.html">Numeric Expressions</a>), and the input line counter register
<code class="code">.c</code> is incremented.
</p>
<div class="example">
<div class="group"><pre class="example-preformatted">.ll 50n
.de I
. ft I
. nop \\$*
. ft
..
Our film class watched
.I The Effect of Gamma Rays on Man-in-the-Moon
Marigolds. \" whoops, the input line wrapped
.br
.I My own opus begins on line \n[.c] \
and ends on line \n[.c].
</pre></div></div>
<div class="example">
<div class="group"><pre class="example-preformatted"> ⇒ Our film class watched <i class="i">The Effect of Gamma Rays on</i>
⇒ <i class="i">Man-in-the-Moon</i> Marigolds.
⇒ <i class="i">My own opus begins on line 11 and ends on line 12.</i>
</pre></div></div>
</dd></dl>
<dl class="first-deffn">
<dt class="deffn" id="index-_005cc-1"><span class="category-def">Escape sequence: </span><span><strong class="def-name"><code class="t">\c</code><span class="r"><i class="slanted"></i></span><code class="t"></code></strong><a class="copiable-link" href='#index-_005cc-1'> ¶</a></span></dt>
<dd><a class="index-entry-id" id="index-_005cc"></a>
</dd><dt class="deffnx def-cmd-deffn" id="index-_005cn_005b_002eint_005d"><span class="category-def">Register: </span><span><strong class="def-name"><code class="t">\n[.int]</code></strong><a class="copiable-link" href='#index-_005cn_005b_002eint_005d'> ¶</a></span></dt>
<dd><a class="index-entry-id" id="index-_002eint"></a>
<a class="index-entry-id" id="index-output-line_002c-continuation-_0028_005cc_0029"></a>
<a class="index-entry-id" id="index-line_002c-output_002c-continuation-_0028_005cc_0029"></a>
<a class="index-entry-id" id="index-continuation_002c-output-line-_0028_005cc_0029"></a>
<a class="index-entry-id" id="index-interrupted-line"></a>
<a class="index-entry-id" id="index-line_002c-interrupted"></a>
<a class="index-entry-id" id="index-_005cR_002c-after-_005cc"></a>
<p><code class="code">\c</code> continues an output line. Nothing after it on the input line
is formatted. In contrast to <code class="code">\<kbd class="key">RET</kbd></code>, a line after <code class="code">\c</code>
remains a new input line, so a control character is recognized at its
beginning. The visual results depend on whether filling is enabled; see
<a class="ref" href="Manipulating-Filling-and-Adjustment.html">Manipulating Filling and Adjustment</a>.
</p>
<ul class="itemize mark-bullet">
<li><a class="index-entry-id" id="index-_005cc_002c-when-filling-enabled"></a>
<a class="index-entry-id" id="index-fill-mode_002c-and-_005cc"></a>
<a class="index-entry-id" id="index-mode_002c-fill_002c-and-_005cc"></a>
If filling is enabled, a word interrupted with <code class="code">\c</code> is continued
with the text on the next input text line, without an intervening space.
<div class="example">
<div class="group"><pre class="example-preformatted">This is a te\c
st.
⇒ This is a test.
</pre></div></div>
</li><li><a class="index-entry-id" id="index-_005cc_002c-when-filling-disabled"></a>
<a class="index-entry-id" id="index-no_002dfill-mode_002c-and-_005cc"></a>
<a class="index-entry-id" id="index-mode_002c-no_002dfill_002c-and-_005cc"></a>
If filling is disabled, the next input text line after <code class="code">\c</code> is
handled as a continuation of the same input text line.
<div class="example">
<div class="group"><pre class="example-preformatted">.nf
This is a \c
test.
⇒ This is a test.
</pre></div></div>
</li></ul>
<p>An intervening control line that causes a break overrides <code class="code">\c</code>,
flushing out the pending output line in the usual way.
</p>
<a class="index-entry-id" id="index-interrupted-line-register-_0028_002eint_0029"></a>
<a class="index-entry-id" id="index-continued-output-line-register-_0028_002eint_0029"></a>
<p>The <code class="code">.int</code> register contains a positive value if the last output
line was continued with <code class="code">\c</code>; this datum is associated with the
environment (see <a class="pxref" href="Environments.html">Environments</a>).<a class="footnote" id="DOCF69" href="groff.html_fot.html#FOOT69"><sup>69</sup></a>
</p></dd></dl>
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