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<title>print command — LAMMPS 15 May 2015 version documentation</title>
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<li>print command</li>
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<div class="section" id="print-command">
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<span id="index-0"></span><h1>print command<a class="headerlink" href="#print-command" title="Permalink to this headline">¶</a></h1>
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<div class="section" id="syntax">
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<h2>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-python"><div class="highlight"><pre>print string keyword value
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</pre></div>
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</div>
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<ul class="simple">
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<li>string = text string to print, which may contain variables</li>
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<li>zero or more keyword/value pairs may be appended</li>
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<li>keyword = <em>file</em> or <em>append</em> or <em>screen</em></li>
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</ul>
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<pre class="literal-block">
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<em>file</em> value = filename
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<em>append</em> value = filename
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<em>screen</em> value = <em>yes</em> or <em>no</em>
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</pre>
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</div>
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<div class="section" id="examples">
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<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-python"><div class="highlight"><pre>print "Done with equilibration" file info.dat
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print Vol=$v append info.dat screen no
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print "The system volume is now $v"
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print 'The system volume is now $v'
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print """
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System volume = $v
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System temperature = $t
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"""
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</pre></div>
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</div>
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</div>
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<div class="section" id="description">
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<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
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<p>Print a text string to the screen and logfile. The text string must
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be a single argument, so if it is one line but more than one word, it
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should be enclosed in single or double quotes. To generate multiple
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lines of output, the string can be enclosed in triple quotes, as in
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the last example above. If the text string contains variables, they
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will be evaluated and their current values printed.</p>
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<p>If the <em>file</em> or <em>append</em> keyword is used, a filename is specified to
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which the output will be written. If <em>file</em> is used, then the
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filename is overwritten if it already exists. If <em>append</em> is used,
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then the filename is appended to if it already exists, or created if
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it does not exist.</p>
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<p>If the <em>screen</em> keyword is used, output to the screen and logfile can
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be turned on or off as desired.</p>
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<p>If you want the print command to be executed multiple times (with
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changing variable values), there are 3 options. First, consider using
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the <a class="reference internal" href="fix_print.html"><em>fix print</em></a> command, which will print a string
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periodically during a simulation. Second, the print command can be
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used as an argument to the <em>every</em> option of the <a class="reference internal" href="run.html"><em>run</em></a>
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command. Third, the print command could appear in a section of the
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input script that is looped over (see the <a class="reference internal" href="jump.html"><em>jump</em></a> and
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<a class="reference internal" href="next.html"><em>next</em></a> commands).</p>
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<p>See the <a class="reference internal" href="variable.html"><em>variable</em></a> command for a description of <em>equal</em>
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style variables which are typically the most useful ones to use with
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the print command. Equal-style variables can calculate formulas
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involving mathematical operations, atom properties, group properties,
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thermodynamic properties, global values calculated by a
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<a class="reference internal" href="compute.html"><em>compute</em></a> or <a class="reference internal" href="fix.html"><em>fix</em></a>, or references to other
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<a class="reference internal" href="variable.html"><em>variables</em></a>.</p>
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</div>
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<div class="section" id="restrictions">
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<h2>Restrictions<a class="headerlink" href="#restrictions" title="Permalink to this headline">¶</a></h2>
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<blockquote>
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<div>none</div></blockquote>
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</div>
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<div class="section" id="related-commands">
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<h2>Related commands<a class="headerlink" href="#related-commands" title="Permalink to this headline">¶</a></h2>
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<p><a class="reference internal" href="fix_print.html"><em>fix print</em></a>, <a class="reference internal" href="variable.html"><em>variable</em></a></p>
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</div>
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<div class="section" id="default">
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<h2>Default<a class="headerlink" href="#default" title="Permalink to this headline">¶</a></h2>
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<p>The option defaults are no file output and screen = yes.</p>
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