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I don't know any direct way of getting the command name from within awk. With GNU awk running on GNU/Linux you can use the process ID and ps to retrieve the command name as a workaround. For example:

cmdname.awk

#!/usr/bin/gawk -f

BEGIN {
  "ps -p " PROCINFO["pid"] " -o comm=" | getline CMDNAME
  print CMDNAME
}

Output:

cmdname.awk