tail -f /var/log/apache2/error.log | grep –line-buffered mod_rewritetail -f /var/log/apache2/error.log | grep –line-buffered mod_rewrite with awk: tail -f /var/log/messages | grep –line-buffered auth | stdbuf -o0 awk -F" " ‘{print $2}’tail -f /var/log/messages | grep –line-buffered auth | stdbuf -o0 awk -F" " ‘{print $2}’