Bash – How to source the bashrc file every time I ‘clear’

Anything more complicated that supplying a few extra arguments to a command is too much for an alias and requires a function instead. Use builtin cd to call the original.

cd () {
  if [ "$*" = ".." ]; then
    echo 1>&2 'Use your alias instead!'
    return 2
  else
    builtin cd "$@"
  fi
}

If you're running bash ≥4.0, I question the utility of this particular alias. Put shopt -s autocd in your ~/.bashrc, and just type .. or any other directory name to switch to it.

Use single quotes to suppress processing of special characters. You could also backslash the $s.

For a complex command you are probably better off using a function in any case, which doesn't require any escaping and is easier to read and edit:

svnbranch() {
    svn diff -r $(svn info | grep ^Revision | awk {'print $2'}):HEAD $(svn info | grep ^URL | awk {'print $2'}) | colordiff
}

You can define a function anywhere you could define an alias.