 <p>PS1=.. Is setting the value of the prompt that is displayed</p> <p>export LC_ALL is settiing an environment variable that will be available to programmes that bash executes. See <a href="http://pubs.opengroup.org/onlinepubs/7908799/xbd/envvar.html" rel="nofollow">http://pubs.opengroup.org/onlinepubs/7908799/xbd/envvar.html</a></p>