Let's Encrypt is a free, automated, and open certificate authority brought to you by the non-profit Internet Security Research Group (ISRG). To enable HTTPS on your website, you need to get a certificate (a type of file) from a Certificate Authority (CA). Let’s Encrypt is a CA. In order to get a certificate for your website’s domain from Let’s Encrypt, you ...


Here are some command line examples, which i've used over time.

  1. Add 2nd & 10th values for matching pattern "Eg: eth0 in /proc/net/dev"
    TOT=$(awk '{ if ($1 ~ /eth0/) print $2 + $10 }' < /proc/net/dev)
  2. Add all the values for a matching pattern "Eg:- proc3 in /proc/net/rpc/nfs"
      nfs_tot=$(awk '{ ...