How to exclude from `lsof` output the libraries?

Question

I want to print in a log with the help of lsof the information about opened resources but I don't want the customer to see what libraries are used. I browsed through the lsof man page but I cannot get a hold of how I can exclude only the libraries from the output. Is there an easy method to do this?

Answer 1

you can use sed, awk, cut for parsing output of lsof, show only those lines, which doesn't have Lnn and ltx in their 4th field.

Answer 2

You can exclude content from the output of lsof using it's -d flag along with it's negation character ^

For example, the following will prevent the txt file descriptor being displayed by lsof.

lsof -d '^txt'