tail -n 1500 log.log | more 

tail -f -n 1500 log.log

ps -ef |grep processname |awk '{print $2}'|xargs kill -9

ps -ef |grep processname |grep -v grep | awk '{print $2}'| xargs echo Explain :  ps -ef  --> ps list processes . -e show all processes , not just those belonging to the user . -f show processes in full format .             grep processname  --> find lines containing   processname .             grep -v grep --> filter out the grep process .             awk 'print $2' --> tokenize  a line by blank space  .  $2  take the second word .   reference : http://blog.51cto.com/loofeer/775267            xargs --> construct the input param as a list .             kill -9  --> kill all the processes by input pid