What is the significance of -n parameter passed to sed command?

Question

Can someone please tell me how does sed -n \'1!p work ? Below is the full command which I am using to sort my pods in k8s based on nodes they are assigned.

Answer 1

From info sed:

-n: By default, 'sed' prints out the pattern space at the end of each cycle through the script (*note How 'sed' works: Execution Cycle.). These options disable this automatic printing, and 'sed' only produces output when explicitly told to via the 'p' command.

1p: print first line

1!p: do not print first line.