On Tue, 2011-05-24 at 09:41 +0300, Alkis Georgopoulos wrote:
> Στις 23-05-2011, ημέρα Δευ, και ώρα 12:17 -1000, ο/η Warren Togami Jr.
> έγραψε:
> > http://hg.fedorahosted.org/hg/virt-manager/rev/1f781890ea4a
> > This is a very similar issue. Notice their kludge to detect nc's
> > capabilities.
>
> I'd use something like this instead, in some initialization code like
> e.g. ltsp-common-functions:
>
> if LANG=C nc -q 2>&1 | grep -q "option requires an argument"; then
> nc_q_param="-q -1"
> fi
>
> And then replace the existing "-q-1" with $nc_q_param (unquoted) in all
> the nc calls.
>
>
> Relevant bug report from Debian:
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=502188
>
>
> Output of the nc* tools available in Ubuntu Lucid:
>
> alkisg@alkis:~$ nc.traditional -q
> nc.traditional: option requires an argument -- 'q'
> nc -h for help
>
> alkisg@alkis:~$ nc.openbsd -q
> nc.openbsd: option requires an argument -- 'q'
> usage: nc [-46DdhklnrStUuvzC] [-i interval] [-P proxy_username] [-p
> source_port]
> [-s source_ip_address] [-T ToS] [-w timeout] [-X proxy_protocol]
> [-x proxy_address[:port]] [hostname] [port[s]]
Output of nc -q on Fedora 14:
$ nc -q
nc: invalid option -- 'q'
usage: nc [-46CDdhklnrStUuvz] [-I length] [-i interval] [-O length]
[-P proxy_username] [-p source_port] [-s source] [-T ToS]
[-V rtable] [-w timeout] [-X proxy_protocol]
[-x proxy_address[:port]] [destination] [port]
Output of nc -q on Red Hat 5
$ nc -q
nc: invalid option -- q
usage: nc [-46DdhklnrStUuvzC] [-i interval] [-p source_port]
[-s source_ip_address] [-T ToS] [-w timeout] [-X proxy_version]
[-x proxy_address[:port]] [hostname] [port[s]]
Perhaps this:
nc_q_param="-q"
nc_output=`LANG=C nc -q 2>&1`
( echo $nc_output |grep -q "option requires an argument" ) \
&& nc_q_param="-q -1"
( echo $nc_output |grep -q "invalid option -- q " ) \
&& nc_q_param=" "
( echo $nc_output |grep -q "invalid option -- 'q' " ) \
&& nc_q_param=" "
unset nc_output
-David
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