Try this (https://askubuntu.com/questions/93566/how-to-log-all-bash-commands-by-all-users-on-a-server). Edit the /etc/bash.bashrc/etc/bash.bashrc file and add the line
export PROMPT_COMMAND='RETRN_VAL=$?;logger -p local6.debug "$(whoami) [$$]: $(history 1 | sed "s/^[ ]*[0-9]\+[ ]*//" ) [$RETRN_VAL]"'
at bottom of the file and save it.