cat config.yaml: This command outputs the contents of the file config.yaml to the standard output. cat is a command used to concatenate and display th

|: This is a pipe operator.

It takes the output from the command on its left (cat config.yaml) and passes it as input to the command on its right (awk NF).
awk NF: This command is an AWK script. NF in AWK stands for “number of fields”. When used without a condition or pattern, AWK prints the entire line if the number of fields (i.e., columns) is not zero. So, awk NF essentially filters out and prints only those lines that are not empty. In this case, it filters out any empty lines from the output of cat config.yaml.
So, overall, the command cat config.yaml | awk NF reads the content of the config.yaml file and filters out any empty lines, printing only the non-empty lines to the standard output.