awk: forcing a return status?

Keep the status in a variable and use it in an END block.

awk -F: 'NF != 7 {print; err = 1}
         END {exit err}' /etc/passwd

I was looking for something similar to Grep, where it will exit 1 if a match is not found. Here is the equivalent with Awk:

#!/usr/bin/awk -f
BEGIN {
   b1 = 1
}
index($0, "sunday") > 0 {
   b1 = 0
   print
}
END {
   exit b1
}