title: UNIX : Deleting all the lines containing string & number
body: <p>I have a <code>TXT</code> files with lines of about 1 Million.</p>
  
  <pre><code>#Test.txt
  zs272
  zs273
  zs277
  zs278
  zs282
  zs285
  zs288
  zs289
  zs298
  zs300
  zs7
  zsa
  zsag
  zsani179yukkie
  zsani182zaide
  zsaqgiw
  zsb86581
  zsbguepqtkcn
  zscazn
  zscfhlsv
  zscgxadrwijl
  zsclions111yuen
  zscwqtk
  zscz
  zsder
  zsdfdgdgg
  </code></pre>
  
  <p>I wanted to delete the line which has the numbers and keeping only strings.</p>
  
  <p>I tried,</p>
  
  <pre><code>grep -v '^[1-9]' Test.txt &gt; 1_Test.txt
  </code></pre>
  
  <p>Couldn't get the desired result.</p>
  
  <p>Expected output:</p>
  
  <pre><code>#1_Test.txt
      zsa
      zsag
      zsbguepqtkcn
      zscazn
      zscfhlsv
      zscgxadrwijl
      zscwqtk
      zscz
      zsder
      zsdfdgdgg
  </code></pre>