ssh and passing second arguments through awk
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From: Arcege on 13 Aug 2010 00:36 On Aug 12, 12:50 pm, K K <mail2rkart...(a)gmail.com> wrote: > I had made some modification in the script > > while read line; do a=`echo $line|awk '{ print $1}'`; b=`echo $line| > awk '{ print $2}'`; ssh $a -l tiki "ping -c 4 $b"; done < /tmp/output/ > 1settmp > > But it still misses out the second pair 192.168.112.16 192.168.4.16 > > But the first pair is working fine 192.168.112.14 192.168.4.14 from > the file /tmp/output/1settmp. > > Its like the script lost the control after doing ssh. > > Any suggestions on this. > > Thanks > Karthik > > On Aug 12, 6:22 am, pac...(a)kosh.dhis.org (Alan Curry) wrote: > > > In article <f39dad35-0458-49a0-a43e-47698f951...(a)v41g2000yqv.googlegroups.com>, > > K K <mail2rkart...(a)gmail.com> wrote: > > > >Wrote a script like this > > > >while read line; do echo $line | ssh -t `awk '{print $1}'` -l user "/ > > >bin/ping -c 4 `awk '{print $2}`"; done < /tmp/output/1settmp > > > Let me clean that up for you... > > > while read pinger pingee; do > > ssh -t $pinger -l user "ping -c 4 $pingee" < /dev/null > > done < thefile > > > >also this one > > > >while read line; do echo $line | ssh -t `cut -d' ' -f1` -l user "/bin/ > > >ping -c 4 `cut -d' ' -f2`"; done < /tmp/output/1settmp > > > >But the problem here is script is taking first column properly but it > > >is not taking the second column. > > >Always its like second column is empty. > > > Of course the second `...` is empty. The first one has already read the line > > from the pipe. There's nothing left for the second cut or awk to read. > > > -- > > Alan Curry You are right, it did lose control after the ssh. Because the ssh reads stdin, in this case the stdin of the while loop - the rest of the 1settmp file. Use the '-n' option on ssh or redirect stdin from / dev/null as someone earlier did. And really... don't use the two awk calls to split the line, use read. while read addr1 addr2 rest; do ssh -n -l tiki $addr1 "ping -c 4 $addr2"; done </tmp/output/1settmp -Arcege
From: K K on 13 Aug 2010 05:52
Thanks a bunch Alan,Ben,Arcege !!! I got it.All Solution works !!! Alan: Sorry missed ur first post/answer Ben: Thanks for correcting me Arcege: Thanks for the latest post Thanks Karthik On Aug 13, 12:36 pm, Arcege <arc...(a)gmail.com> wrote: > On Aug 12, 12:50 pm, K K <mail2rkart...(a)gmail.com> wrote: > > > > > I had made some modification in the script > > > while read line; do a=`echo $line|awk '{ print $1}'`; b=`echo $line| > > awk '{ print $2}'`; ssh $a -l tiki "ping -c 4 $b"; done < /tmp/output/ > > 1settmp > > > But it still misses out the second pair 192.168.112.16 192.168.4.16 > > > But the first pair is working fine 192.168.112.14 192.168.4.14 from > > the file /tmp/output/1settmp. > > > Its like the script lost the control after doing ssh. > > > Any suggestions on this. > > > Thanks > > Karthik > > > On Aug 12, 6:22 am, pac...(a)kosh.dhis.org (Alan Curry) wrote: > > > > In article <f39dad35-0458-49a0-a43e-47698f951...(a)v41g2000yqv.googlegroups.com>, > > > K K <mail2rkart...(a)gmail.com> wrote: > > > > >Wrote a script like this > > > > >while read line; do echo $line | ssh -t `awk '{print $1}'` -l user "/ > > > >bin/ping -c 4 `awk '{print $2}`"; done < /tmp/output/1settmp > > > > Let me clean that up for you... > > > > while read pinger pingee; do > > > ssh -t $pinger -l user "ping -c 4 $pingee" < /dev/null > > > done < thefile > > > > >also this one > > > > >while read line; do echo $line | ssh -t `cut -d' ' -f1` -l user "/bin/ > > > >ping -c 4 `cut -d' ' -f2`"; done < /tmp/output/1settmp > > > > >But the problem here is script is taking first column properly but it > > > >is not taking the second column. > > > >Always its like second column is empty. > > > > Of course the second `...` is empty. The first one has already read the line > > > from the pipe. There's nothing left for the second cut or awk to read.. > > > > -- > > > Alan Curry > > You are right, it did lose control after the ssh. Because the ssh > reads stdin, in this case the stdin of the while loop - the rest of > the 1settmp file. Use the '-n' option on ssh or redirect stdin from / > dev/null as someone earlier did. And really... don't use the two awk > calls to split the line, use read. > > while read addr1 addr2 rest; do ssh -n -l tiki $addr1 "ping -c 4 > $addr2"; done </tmp/output/1settmp > > -Arcege |