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<a href='https://github.com/akkartik/mu/blob/master/real-files.mu'>https://github.com/akkartik/mu/blob/master/real-files.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment"># example program: read a character from one file and write it to another</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment"># BEWARE: this will modify your file system</span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment"># before running it, put a character into /tmp/mu-x</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment"># after running it, check /tmp/mu-y</span>
<span id="L5" class="LineNr"> 5 </span>
<span id="L6" class="LineNr"> 6 </span><span class="muRecipe">def</span> <a href='real-files.mu.html#L6'>main</a> [
<span id="L7" class="LineNr"> 7 </span> <span class="Constant">local-scope</span>
<span id="L8" class="LineNr"> 8 </span> f:num/file <span class="Special"><-</span> $open-file-for-reading <span class="Constant">[/tmp/mu-x]</span>
<span id="L9" class="LineNr"> 9 </span> $print <span class="Constant">[file to read from: ]</span>, f, <span class="Constant">10/newline</span>
<span id="L10" class="LineNr">10 </span> c:char, eof?:bool <span class="Special"><-</span> $read-from-file f
<span id="L11" class="LineNr">11 </span> $print <span class="Constant">[copying ]</span>, c, <span class="Constant">10/newline</span>
<span id="L12" class="LineNr">12 </span> f <span class="Special"><-</span> $close-file f
<span id="L13" class="LineNr">13 </span> $print <span class="Constant">[file after closing: ]</span>, f, <span class="Constant">10/newline</span>
<span id="L14" class="LineNr">14 </span> f <span class="Special"><-</span> $open-file-for-writing <span class="Constant">[/tmp/mu-y]</span>
<span id="L15" class="LineNr">15 </span> $print <span class="Constant">[file to <a href='075channel.mu.html#L60'>write</a> to: ]</span>, f, <span class="Constant">10/newline</span>
<span id="L16" class="LineNr">16 </span> $write-to-file f, c
<span id="L17" class="LineNr">17 </span> f <span class="Special"><-</span> $close-file f
<span id="L18" class="LineNr">18 </span>]
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