Comparison of different interactive shells memory usage Thursday 24 June 2010 at 23:28 On a 64M server. All those shells can be installed on debian with a simple apt-get install. Shell RSS (Resident set size) pdksh 604 zsh 2208 bash 3008 tcsh 1912 dash 492 ksh 1112 fish 2052 And the winner is... dash !