First, I am not sure where I should ask this question. Please point me out the correct forum if this place is not meant for this.
I am looking for a tool that can explain awk commands.
As a reference, check out this website: https://regexr.com/
When you hover on the regex part, it explains you what it does. I am looking for the same feature (does not need to be a website, anything will do as long as I can have the information) for awk.
An example of awk command I need to "decipher":
awk -F"|" 'BEGIN{OFS="|"}{if(FNR>3){for(i=1;i<=NF;i++){sub(/ +$/,"",$i);sub(/^ +/,"",$i)};if(NF!=1){print $2,$3,$4}}}'