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Try this (https://askubuntu.com/questions/93566/how-to-log-all-bash-commands-by-all-users-on-a-server). Edit the /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.