Add alternative approach to parsing `xev`

sheets/xev

@@ -1,3 +1,15 @@
 # Show keycodes used by Xorg
 # start xev and show only the relevant parts:
 xev | awk -F'[ )]+' '/^KeyPress/ { a[NR+2] } NR in a { printf "%-3s %s\n", $5, $8 }'
+
+# Alternative approach to show keycodes, with standard AWK formatting.
+awk '
+	/^KeyPress/ {
+		A[NR+2]
+	}
+
+	NR in A {
+		B=substr($7, 0, length($7) - 2)
+		printf("%3d %s\n", $4, B)
+	}
+' <(xev)