Exemplo do arquivo /root/.bashrc

Editar o arquivo /root/.bashrc

# You may uncomment the following lines if you want `ls' to be colorized:
export LS_OPTIONS='--color=auto'
# eval "`dircolors`"
alias ls='ls $LS_OPTIONS -la'
# alias ll='ls $LS_OPTIONS -l'
# alias l='ls $LS_OPTIONS -lA'
alias grep="grep --color"      # colored grep by default
#
# Some more alias to avoid making mistakes:
# alias rm='rm -i'
# alias cp='cp -i'
# alias mv='mv -i'

Depois disso enviar a mudanças feitas.
source /root/.bashrc

Pronto!