I am new to Unix and I am trying to used pushd, popd and dirs in SUSE Linux but I am getting -ksh: pushd: not found while I try to check pushd  which pushdwhich: no pushd in (/usr/bin:/bin:/usr/sbin:/sbin)I am getting there is not pushd. How to solve this issued. 
-ksh: pushd: not found
ksh;pushd