You would like a file to have filenumbers
You can use the nl command. This command numbers the lines. (empty lines are skipped)
lsof | nl
This will show you all the open files on a linux system and number them.
cat /etc/ftpusers | nl
Will show you the ftpusers number from the beginning.
About the Author
Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux in different European countries and different European languages. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform where he is one of the most important contributors and the main developer.