Hi markuhs, thanks for the code , here the thing is I am automating GUI installation of application using win32 GUI module. once I click on install It will generate a log file and it took almost 40 min to 1 hr depending upon system resources. I tried the code provided by U . but it is coming once log is created and going to else coz the word 'SUCCESSFUL' only appear after 40 min , here I just want to tail the application until it reaches SUCCESSFUL , ofcourse if the installation didn't went of well we can't see the msg in log, there is constant keywork "TIME" at the end of the file ... So I want to tail the log file until it got the keyword "TIME" once it reads the keyword "TIME" then I can assume that installation is over either it is SUCCESSFUL or not, could u help in this.