title: How to read and delete a specific row from a large file with R
body: <p>The fist 5 rows of a large file (1000 000 rows in total) are as follows:</p>
  
  <blockquote>
    <p>c6 c24 c32 c54 c67<br>
    c6 c24 c32 c51 c68 c78<br>
    c6 c32 c54 c67<br>
    c6 c32 c55 c63 c85 c94 c75<br>
    c6 c32 c53 c67<br></p>
  </blockquote>
  
  <p><b>readLines()</b> can read a row at a time from the 1st rows.When I want to read the 20001th row,<b>readLines()</b> is not so efficient.Are there R functions can be used to <b>read</b> and<b> delete </b>a specific row from a large file. Thank you.</p>