Hi what about if i want to run both commands simultaneous and send the output to a file how can i do that
2011/10/29 Bob Proulx <b...@proulx.com> > dan12341234 wrote: > > im running 4 scripts that perform ssh and tail -f on a file exist on 4 > > servers and display on the screen. > > (1 script per servers) > > > > ssh server1 tail -f /var/log/apache/access_log > > ssh server2 tail -f /var/log/apache/access_log > > ssh server3 tail -f /var/log/apache/access_log > > ssh server4 tail -f /var/log/apache/access_log > > > > the problem is that the display dosent show any identification from which > > server each line > > > > what i need is something with an echo servername, before each line > printed > > to the screen > > There are many specialized programs to do exactly what you are asking > such as dsh (distributed shell) and other tools. You might want to > investigate those. > > But you can do what you want by using sed to prepend to the line. > > ssh -n server1 'tail -f /var/log/syslog | sed --unbuffered > "s/^/$(hostname): /"' > ssh -n server2 'tail -f /var/log/syslog | sed --unbuffered > "s/^/$(hostname): /"' > > You might consider applying the commands as standard input instead. I > think it is easier to avoid quoting problems that way. > > echo 'tail -f /var/log/syslog | sed --unbuffered "s/^/$(hostname): /"' | > ssh -T server1 > > Bob >
