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Of course, lsof works with other Unices just fine.
One of the least-talked-about tools in a UNIX sysadmin's toolkit is lsof. Lsof lists information about files opened by processes. But that's really an understatement.
Most people forget that, in UNIX, (almost) everything is a file. The OS makes hardware available to applications by way of files in /dev. Kernel, system, memory, device etc. information in made available inside files in /proc. TCP/UDP sockets are sometimes represented internally as files. Even directories are really just files containing other filenames.
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