When trying a tab-comletion for iwconfig <interface> rate, I get an awk error:

# iwconfig wlan0 rate awk: /^[[:space:]]*[0-9]/ {print $1\"M\"}
awk:                               ^ backslash not last character on line
awk: /^[[:space:]]*[0-9]/ {print $1\"M\"}
awk:                               ^ backslash not last character on line

auto   fixed

removing the two superfluous backslashes gets me rid of the error. My wlan driver does not report rates, so  down*t know if it works right, but seems to be sane to me.