Erik N Johnson wrote:
To get data back from a network daemon using this technique is quite
trivial, if you are using an X windows desktop. Simply open up two
xterms.
xterm 1:
# tee rx.log </dev/tcp/<host>/<port>
xterm 2:
# echo <arbitrary message>| tee tx.log >/dev/tcp/<host>/<port>
Send whatever you want to your remote host, and watch the response
spew out on your terminal. You can also go back through the logs
later if you like.
Erik Johnson
Did you try that Erik? Did tried several things of that kind. I think
the problem I had is that it creates two sessions.
On Fri, Feb 27, 2009 at 7:09 AM, Steffen Maier <[email protected]> wrote:
On 02/27/2009 09:28 AM, John Summerfield wrote:
John McKown wrote:
First: using redirection to write to or read from an IP port
command >/dev/tcp/${HOST}/${PORT}
but how does one carry on a sensible conversation? I can send stuff to
sendmail, but how do I get its responses?
See bftpget (an ftp client with bash-builtins only) in
ftp://ftp.heise.de/pub/ct/listings/0702-178.zip
(from an article in a german journal which is unfortunately not freely
available on the net:
http://www.heise.de/kiosk/archiv/ct/2007/2/178_kiosk).
16:23 [sum...@bobtail ~]$ ls -l /dev/tcp/ns
ls: /dev/tcp/ns: No such file or directory
16:24 [sum...@bobtail ~]$ ls -l /dev/tcp/ns:22
ls: /dev/tcp/ns:22: No such file or directory
AFAIK, these are pseudo files handled internally by bash, so they won't
appear in the file system.
<( command ) and >( command )
[snip]
via a /dev/fd/n.
Bash meanwhile implements process substitution by means of /dev/fd,
optionally by means of named pipes (FIFOs).
I think this sort of thing is a bit OS-dependent. It works with some
(2.4 and later I suspect) Linux kernels, likely not with *BSD, Solaris
and such, but I don't have any alternative systems to test on.
Linux implements /dev/fd as a symlink to /proc/self/fd.
I found /dev/fd/... available on Solaris 10 (on Sparc) implemented with
character devices.
� (echo >&5) 5>tempfile
where tempfile could be something above. I've used this sometimes in
scripts: think of any kind of program that produces more than one report
and you will find a use.
Redirection of arbitrary file descriptors is very handy, especially in
combination with the exec shell builtin. E.g., configure from autoconf
makes heavy use of it.
Steffen
Linux on System z Development
IBM Deutschland Research & Development GmbH
Vorsitzender des Aufsichtsrats: Martin Jetter
Gesch�ftsf�hrung: Erich Baier
Sitz der Gesellschaft: B�blingen
Registergericht: Amtsgericht Stuttgart, HRB 243294
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--
Cheers
John
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