Linux : How to use tail option in opened log file?

Question

I am using Putty to connect to Linux server .

I opened a Log file in Linux server using the $ tail -f error_log

A log file has been displayed .

Please tell me how can i do ps –ef|grep java on to the opened Log file

Thank you .

Answer 1

Your question is hard to understand but I think I know what you're asking.

Doing this:

tail -f logfile | grep java

will show you lines with the text java in the file as the file is updated.

Answer 2

If you just want a regularly updated list of java processes, you can use watch:

watch 'ps -ef | grep [j]ava'

Answer 3

And if you don't want a regularly updated list of the process you are looking for you can do so:

vim error_log

and when inside the file reading, just do a simple search for what are you looking for.

/java

and press 'n' for next result.

Check this link: http://vim.wikia.com/wiki/Search_and_replace for vim Search & replace cheatsheet