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<div><a href="index.html" title="">Macaulay2Doc</a> > <a href="___The_sp__Macaulay2_splanguage.html" title="">The Macaulay2 language</a> > <a href="_operators.html" title="">operators</a> > <a href="__lt_lt.html" title="a binary operator (file output, ...)"><<</a></div>
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<div><h1><< -- a binary operator (file output, ...)</h1>
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<div class="waystouse"><h2>Ways to use <tt><<</tt> :</h2>
<ul><li><span><< Thing, see <span><a href="___File_sp_lt_lt_sp__Thing.html" title="print to a file">File << Thing</a> -- print to a file</span></span></li>
<li><span>File << Manipulator, see <span><a href="___File_sp_lt_lt_sp__Thing.html" title="print to a file">File << Thing</a> -- print to a file</span></span></li>
<li><span>File << Net, see <span><a href="___File_sp_lt_lt_sp__Thing.html" title="print to a file">File << Thing</a> -- print to a file</span></span></li>
<li><span>File << String, see <span><a href="___File_sp_lt_lt_sp__Thing.html" title="print to a file">File << Thing</a> -- print to a file</span></span></li>
<li><span>File << Symbol, see <span><a href="___File_sp_lt_lt_sp__Thing.html" title="print to a file">File << Thing</a> -- print to a file</span></span></li>
<li><span><a href="___File_sp_lt_lt_sp__Thing.html" title="print to a file">File << Thing</a> -- print to a file</span></li>
<li><span>List << Thing, see <span><a href="___File_sp_lt_lt_sp__Thing.html" title="print to a file">File << Thing</a> -- print to a file</span></span></li>
<li><span>Nothing << Manipulator, see <span><a href="___File_sp_lt_lt_sp__Thing.html" title="print to a file">File << Thing</a> -- print to a file</span></span></li>
<li><span>Nothing << Thing, see <span><a href="___File_sp_lt_lt_sp__Thing.html" title="print to a file">File << Thing</a> -- print to a file</span></span></li>
<li><span>String << Thing, see <span><a href="___File_sp_lt_lt_sp__Thing.html" title="print to a file">File << Thing</a> -- print to a file</span></span></li>
<li><span>CC << ZZ, see <span><a href="_left_spshift.html" title="">left shift</a></span></span></li>
<li><span>RR << ZZ, see <span><a href="_left_spshift.html" title="">left shift</a></span></span></li>
<li><span>ZZ << ZZ, see <span><a href="_left_spshift.html" title="">left shift</a></span></span></li>
<li><span>NetFile << Manipulator, see <span><a href="___Net__File.html" title="the class of all net files">NetFile</a> -- the class of all net files</span></span></li>
<li><span>NetFile << Net, see <span><a href="___Net__File.html" title="the class of all net files">NetFile</a> -- the class of all net files</span></span></li>
<li><span>NetFile << String, see <span><a href="___Net__File.html" title="the class of all net files">NetFile</a> -- the class of all net files</span></span></li>
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<div class="waystouse"><h2>For the programmer</h2>
<p>The object <a href="__lt_lt.html" title="a binary operator (file output, ...)"><<</a> is <span>a <a href="___Keyword.html">keyword</a></span>.</p>
<div><div><p>This operator may be used as a binary operator in an expression like <tt>x<<y</tt>. The user may install <a href="_binary_spmethods.html" title="">binary methods</a> for handling such expressions with code such as</p>
<pre> X << Y := (x,y) -> ...</pre>
<p>where <tt>X</tt> is the class of <tt>x</tt> and <tt>Y</tt> is the class of <tt>y</tt>.</p>
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<div><p>This operator may be used as a prefix unary operator in an expression like <tt><<y</tt>. The user may <a href="_installing_spmethods.html">install a method</a> for handling such expressions with code such as</p>
<pre> << Y := (y) -> ...</pre>
<p>where <tt>Y</tt> is the class of <tt>y</tt>.</p>
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