On Ubuntu, add $HOME/bin/ (careful with the escape) to your PATH,

cat /etc/environment
mv -i /etc/environment /etc/environment.dist
cat > /etc/environment <<-EOF
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:\$HOME/bin"
EOF
source /etc/environment
echo $PATH

While on Debian, replace the whole if root condition to,

cp -pi /etc/profile /etc/profile.dist
vi /etc/profile

PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:$HOME/bin"

source /etc/profile
echo $PATH

Provide handy command aliases,

#centos
cp -pi /etc/bashrc /etc/bashrc.dist
config=/etc/bashrc

#ubuntu/debian
cp -pi /etc/bash.bashrc /etc/bash.bashrc.dist
config=/etc/bash.bashrc

cat >> $config <<-EOF
alias ll='ls -alhF'
alias cp='cp -i'
alias mv='mv -i'
alias rm='rm -i'
alias runq='postfix flush'
alias netstata='netstat -antupe --inet --inet6'
alias push='git nc && git push'
alias stat='git diff --stat --cached origin/master'
alias ovs='ovs-vsctl'
alias irssi='echo forgot screen?'

#export DEBIAN_FRONTEND=noninteractive
export LANGUAGE="en_US.UTF-8"
export LC_ALL="en_US.UTF-8"
EOF

#export EDITOR=vi
#export TERM=xterm-256color
#export LANG=en_US.UTF-8

tail /etc/bash.bashrc
source $config
unset config

Ref. http://www.robmeerman.co.uk/unix/256colours