What is the benefit of using (lsof ) command in linux ?

[The first]

hello all

I have a question 

What is the benefit of using (lsof ) command in linux ?

[ghostdog74]

have you seen the man page of lsof? lsof is a tool to see open files. there are various other options of lsof , one example is listing which process opens a port, try this

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lsof -i tcp:80
sometimes you try to umount a partition, but it gives error saying you can't unmount. You can use lsof to check what is holding it up

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lsof | grep /mnt/partition