Linux: Find out how many file descriptors are being used

While administrating a box, you may wanted to find out what a processes is doing and find out how many file descriptors (fd) are being used. You will surprised to find out that process does open all sort of files:
=> Actual log file
=> /dev files
=> UNIX Sockets
=> Network sockets
=> Library files /lib /lib64
=> Executables and […]

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="=" "http://www.cyberciti.biz/tips/linux-procfs-file-descriptors.html"=""http://www.cyberciti.biz/tips/linux-procfs-file-descriptors.html"" title="title" find="Find" out="out" how="how" many="many" file="file" descriptors="descriptors" are="are" being="being" used"="used"" target="_blank">Linux: Find out how many file descriptors are being used