maximum number of open files and file descriptors in linux

To see open files in linux use the command

There is a limit set in the kernel on how many open file descriptors are allowed on the system. This may be compiled in, or it may be tunable on the fly. In Linux, the value of this parameter can be read from and written to the proc filesystem.

On this system 1,31,072 open file descriptors are permitted. We are unlikely to run out. If we wanted to change it, we’d do something like this:

But how do we know how many file descriptors are being used?

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