Yes, there are differences. I used only standard awk facilities, and tested my project with gawk, mawk and nawk. I've also been burned when I discovered that R

Yes, there are differences. I used only standard awk facilities, and tested my project with gawk, mawk and nawk. I've also been burned when I discovered that Raspbian ships with an older version of mawk that did something differently in the way it processed regexen that caused my script to break.