in /etc/profile
alias wget 'wget -c'
OR:
If its got a /etc/profile.d/
add a file called wget-c.sh
in that file:
if [ -n "$BASH_VERSION" -o -n "$KSH_VERSION" -o -n "$ZSH_VERSION" ]; then
# for bash, pdksh and zsh
alias wget 'wget -c'
fi
That will take care of all "bash, ksh, zsh" shells any other won't get it.