How to check what version of netcat am I running

netcatversion

netcat doesn't support --version or --license flag, running strings against the binary doesn't mention version number or anything of that kind. How can I reliably check what does version (openbsd/gnu + version number) does a particular nc binary implement?

Best Answer

For Debian, Ubuntu, and Mint:

netcat -h
nc -h

For Fedora, Red Hat Enterprise Linux, and CentOS:

ncat -h

The first line of those commands will give the version.

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How to pipe data over network or serial to the display of another linux machine

netcat springs to mind; it may be the more sensible choice (given the no-overhead, no compression approach to network communications) on your low-spec receiving machine.

A nice usage example can be found here:
https://stackoverflow.com/questions/4113986/example-of-using-named-pipes-in-linux-bash

NFS Configuration – How to Determine the NFS Server Version

The nfsstat -c program will show you the NFS version actually being used.

If you run rpcinfo -p {server} you will see all the versions of all the RPC programs that the server supports. On my system I get this output:

$ rpcinfo -p localhost
   program vers proto   port
    100000    2   tcp    111  portmapper
    100000    2   udp    111  portmapper
    ...
    100003    2   tcp   2049  nfs
    100003    3   tcp   2049  nfs
    100003    4   tcp   2049  nfs
    100003    2   udp   2049  nfs
    100003    3   udp   2049  nfs
    100003    4   udp   2049  nfs
    ...

This shows me that my NFS server (localhost in this example) offers versions 2, 3, and 4 of the NFS protocol all over UDP and TCP.

Best Answer

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How to pipe data over network or serial to the display of another linux machine

NFS Configuration – How to Determine the NFS Server Version

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