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ulimit -a tells me I have a limit of 1024 open files, which is the default on my distro. Is there a way to show how many of these are currently used, or how many are remaining?

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up vote 4 down vote accepted

This limit apply per process.

One way to get the number of open files per process would be on Linux or Solaris:

for i in /proc/*/fd
    [ -r $i ] && printf "%6d : %d\n" $(basename $(dirname $i)) $(ls $i | wc -l)
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If I start a shell, isn't this limit inherited to all child processes which I do further start from this shell? – hirschhornsalz May 11 '11 at 14:00
Or more exactly, is the number of the remaining open files inherited? – hirschhornsalz May 11 '11 at 14:05
No. Each subprocess starts with the full number of available fds. What is inherited is that limit, which can be reduced (or raised if you have the privileges). – jlliagre May 11 '11 at 14:32

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