.
In the excerpted .bashrc in post 4, there is an unfortunate omission.

You will either need to change the grepx reference to grep,
or add the missing alias for grepx which is:

alias grepx='grep -i --color'.

Either correction should suffice, but grepx is a little more interesting, IMO.
Also, there's already a convenient spot for this alias on the line which now reads:

alias nl="echo -e '\r'" ;

which includes an otherwise unnecessary semi-colon.
In any event, don't omit the semi-colon if the two aliases are on the same line.