bash: prompt escaping and substitution fixes
bash: prompt escaping and substitution fixes

marc0uk/dotfiles,micahwood/linux-dotfiles,lgaechter/dotfiles,senorflor/dotfiles,micahwood/linux-dotfiles,codfish/dotfiles,bronxct1/dotfiles,seiryu9/dotfiles,SiTaggart/dotfiles,seiryu9/dotfiles,micahwood/linux-dotfiles,necolas/dotfiles,sdillingham/dotfiles,senorflor/linux-dotfiles,pmacom/dotfiles,saclark/dotfiles,micahwood/linux-dotfiles,SBoudrias/dotfiles,bronxct1/dotfiles,nick-thompson/dotfiles,jmyser/dotfiles,micahwood/linux-dotfiles,pertoyra/dotfiles,intiocean/dotfiles,codfish/dotfiles,Stubby/dotfiles,Stubby/dotfiles,Gastove/dotfiles