'[eos] cd ...' provides the namespace change directory command in EOS.
cd <dir>|-|..|~
Options:
cd <dir> :
change into direcotry <dir>. If it does not exist, the current directory will stay as before!
cd - :
change into the previous directory
cd .. :
change into the directory one level up
cd ~ :
change into the directory defined via the environment variable EOS_HOME