Bash function to create the next SVN release tag
Here is a small improvement.

svnnextrelease() {
  v=$(svn ls ^/tags/release | tail -n 1)
  svn cp ^/trunk ^/tags/release/$((${v%/} + 1 )) -m "$@"
}



You can use $(( )) as a replacement for expr in bash. (depends on your taste.)
bash can cheaply get rid of / for you.