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Broadcast your shell thru ports 5000, 5001, 5002 ...

Terminal - Broadcast your shell thru ports 5000, 5001, 5002 ...
script -qf | tee >(nc -kl 5000) >(nc -kl 5001) >(nc -kl 5002)
2010-10-11 07:55:30
User: clvv
Functions: script tee
37
Broadcast your shell thru ports 5000, 5001, 5002 ...

run 'nc yourip 5000', 'nc yourip 5001' or 'nc yourip 5002' elsewhere will produce an exact same mirror of your shell. This is handy when you want to show someone else some amazing stuff in your shell without giving them control over it.

Alternatives

There is 1 alternative - vote for the best!

Terminal - Alternatives
bash -i 2>&1 | tee /dev/stderr | nc -l 5000
2010-10-20 18:32:12
User: pykler
Functions: bash tee
Tags: nc
4

Doesn't work so well if you connect from windows. Linux only sends LF where windows wants CRLF. The alternative command works better with windows, however it uses script and a named pipe.

script -qf >(nc -ub 192.168.1.255 5000)
2011-04-23 12:38:25
User: Archiater
Functions: script
Tags: pipe script nc
1

Better solution in case of many clients, imo.

script -qf | tee >(nc -l -p 5000)
2013-04-13 00:22:02
User: nesses
Functions: script tee
Tags: tee pipe script nc
-1

solution that works for me

Know a better way?

If you can do better, submit your command here.

What others think

nc: invalid option -- q
Comment by DaveQB 306 weeks and 6 days ago

nc-1.84-10.fc6.x86_64

CentOS 5

Comment by DaveQB 306 weeks and 6 days ago

Looks like CentOS' nc doesn't support -q option, simply remove the -q0 argument, it will still work, but nc will still be running in background even if your terminated your broadcast session.

Comment by clvv 306 weeks and 6 days ago

mkfifo /tmp/fifo;(nc -q0 -l 5000 < /tmp/fifo > /dev/null &);script -f /tmp/fifo

Is a little better, because nc -l will echo text received by client.

So in my modified script STOUT is redirecting to /dev/null. no more echo will be shown

Comment by anonjoe 306 weeks and 4 days ago
mkfifo /tmp/fifo;(nc -q0 -k -l 5000 < /tmp/fifo > /dev/null &);script -f /tmp/fifo

add -k to nc, so your command will stay online even when your client will disconnect

Comment by anonjoe 306 weeks and 4 days ago

A simpler way:

script -f >(nc -l 5000)
Comment by dstahlke 306 weeks and 4 days ago

why do you all forget the -p before the 5000 ??? I took me so long to figure that out, couldn't make it work before until I put the -p:

mkfifo /tmp/fifo;(nc -q0 -l -p 5000 < /tmp/fifo &);script -f /tmp/fifo mkfifo /tmp/fifo;(nc -q0 -k -l -p 5000 < /tmp/fifo > /dev/null &);script -f /tmp/fifo script -f >(nc -l -p 5000)

Great tip by the way, now I can vote for it and make it as favorite.

Comment by nickwe 305 weeks and 3 days ago

doesn't work for me unless I change this:

nc -l 5000

...to this:

nc -l -p 5000

(tested on ubuntu 10 LTS and debian 5

Comment by linuxrawkstar 305 weeks and 3 days ago

doesn't work for me unless I change this:

nc -l 5000

...to this:

nc -l -p 5000

(tested on ubuntu 10 LTS and debian 5

Comment by linuxrawkstar 305 weeks and 3 days ago

Is there an extra option which will allow multiple clients listening to your broadcast?

Comment by alperyilmaz 282 weeks ago

I think the solution is "socat" but couldn't figure out the options..

Comment by alperyilmaz 282 weeks ago

@alperyilmaz I haven't figure out a way to do this only using common utilities yet. But here is a quick work around:

script -qf | tee >(nc -kl 5000) >(nc -kl 5001) >(nc -kl 5002)
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Comment by sanjunn 13 weeks and 4 days ago

Your point of view

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