Description of problem:
urpmi bash completion trust aliases of sed and grep where it shouldn't.

A possible fix would be to force 
Please change line 11 in /etc/bash_completion.d/urpmi to :
        | \sed -e 's/(/\\(/g' -e 's/)/\\)/g' -e 's/ /\\ /g' ) )

Please change line 27 in /etc/bash_completion.d/urpmi to :
        | \grep "^${cur//\\\\/}" ` )

Please change line 48 in /etc/bash_completion.d/urpmi to :
COMPREPLY=( $( compgen -W "$(urpmq $options --list | \grep ^$cur )" -- ) )

The backslash will disable any alias on sed or grep.

An unalias sed 2>/dev/null or unalias grep 2>/dev/null is an other option.

Version-Release number of selected component (if applicable):
urpmi-8.105-1.mga6

How reproducible:
Always

Steps to Reproduce:
1. echo "alias grep='grep --color=always'" >> ~/.bashrc
2. . ~/.bashrc
3. urpmi varni<tab>
4. urpmi ^[[01;31m^[[Kvarni^[[m^[[Ksh