my bashrc

PS1='\[\e[0;32m\]\u\[\e[m\]@$(hostname) \[\e[1;34m\]\W\[\e[m\] \[\e[1;32m\]\$\[\e[m\] '
alias rootdb='mysql -u"root" -p"root"'
export EDITOR=vim

Get free space in gigabytes at specified location

df -k /opt/ | awk 'END{print $4/1024/1024}'