title: RRDtool and left horizontal scale formatting
body: <p>Im learning RRDtool. I created a graph:</p>
  
  <pre><code>#!/bin/bash
  
  rrdtool graph /home/pi/rrd/test.png \
      --end now --start now-6000s --width 500 --height 400 \
      DEF:ds0a=/home/pi/rrd/temperature.rrd:temperature:AVERAGE \
      AREA:ds0a#0000FF:"Temperature ('C)\l" \
  </code></pre>
  
  <p>It looks like this:</p>
  
  <p><img src="https://i.stack.imgur.com/84Vdo.png" alt="enter image description here"></p>
  
  <p><strong>How can I format scale to add fractional part?</strong> </p>
  
  <p>I want 25.2, 25.4, 25.6 etc. instead of 25 few times.</p>
  
  <p>I have tried option from RRDtool documentation online</p>
  
  <pre><code>--left-axis-format
  </code></pre>
  
  <p>but my RRDtool has no such option.</p>
  
  <p>There is no problem with</p>
  
  <pre><code>--right-axis-format
  </code></pre>
  
  <p>it works as I want, but... I want correct format on left side, not right.</p>
  
  <p>Im using 1.4.7 on Raspberry Pi. I was asking on unix.stackexchange.com about this, but there are more questions about RRDtool here, so I moved my question here.</p>