title: Removing a line where the first column is not numeric
body: <p>I have a large dataset that is a CSV file and I've already cleaned it up quite a bit. However there are instances where I have a column which is not numeric and I want to remove those rows.</p>
  
  <p>So far I thought something like this would work. I am thinking the solution is probably simple. I am not sure whether I can even do something like this. It is a CSV file so I tried to tell awk that its delimited by commas. Also an example of a good value in column one is this: 323870133825187840</p>
  
  <pre><code>awk '/,/$1 != numeric'
  </code></pre>
  
  <p>Are there any suggestions on this one. I initially thought about doing some kind of a one liner such as, [0-9], etc. I would greatly appreciate it if anyone could help me out with this. For someone out there this is probably like child's play :)</p>