While you are doing awesome stuff, some noisy things bother you. The following tips might help you out.

Skip the first line from output

You want to skip the first line from the output for parsing JSON with jq command.

$ cat <<EOF
skip me please
{
  "hello": "world"
}
EOF

You can do it with awk - a utility tool installed in many Linux distributions. It includes a built-in row number variable NR to skip. For example, NR>1 is an action to skip a 1 row from the beginning.

$ cat <<EOF |awk "NR>1" |jq
skip me please
{
  "hello": "world"
}
EOF

Now, the JSON output can be parsed by jq

{
  "hello": "world"
}

docker images |awk 'NR>1 {print $1":"$2}'
  • NR>1 skips the docker images output header REPOSITORY:TAG
  • Concatenate 2 columns with ":"