PS1 problem, messing up CLI

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http://askubuntu.com – I did a simple PS1 assignment PS1="\e[0;31m[\W]\$ \e[m " All I wanted to do was to change the prompt color and display only the relative path. However this messes up the CLI. For example, when browsing history with the ↑ it crops and overlaps the display. When i type a long command the cursor moves to the beginning of the screen overlapping with the prompt display itself. What have I done wrong? (HowTos)