If you want to understand this more, read "Bash Startup Files" and "Interactive Shells" from the Bash Reference Manual. http://www.gnu.org/software/bash/manual

If you want to understand this more, read "Bash Startup Files" and "Interactive Shells" from the Bash Reference Manual. http://www.gnu.org/software/bash/manual/bashref.html#Bash-Startup-Files http://www.gnu.org/software/bash/manual/bashref.html#Bash-St... http://www.gnu.org/software/bash/manual/bashref.html#Interactive-Shells http://www.gnu.org/software/bash/manual/bashref.html#Interac...