In /usr/bin/routel line 18:
 while read network rest
       ^--^ SC2162: read without -r will mangle backslashes.


In /usr/bin/routel line 19:
 do set xx $rest
        ^-- SC2121: To assign a variable, use just 'var=value', no 'set ..'.
           ^---^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
 do set xx "$rest"

For more information:
  https://www.shellcheck.net/wiki/SC2121 -- To assign a variable, use just 'v...
  https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing ...
  https://www.shellcheck.net/wiki/SC2162 -- read without -r will mangle backs...