A note for Unix command :

1.infinite loop for monitoring space

while true; do df -g /mount1 ; sleep 10; done

2.Find file which modified more than 2 days ago

 find /mount1 -name '*.123' -mtime +2 

3.Checking oracle connected user (showing pid,memory used, argument)

ps -ef -o pid,vms,args | grep oracle

4.Find file and delete it

find /mount1 -name '*.123' -mtime +3 -exec rm {} \; 

5.Kill all user connected to oracle database

 ps -ef | grep oracle($ORACLE_SID) | awk '{print $2}' | xargs kill -9