Thanks Bob this solution is great.
Dan Bob Proulx wrote: > > 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 > > > -- View this message in context: http://old.nabble.com/problem-with-tail--f-that-need-to-add-to-each-line-constant-string-at-the-beginning-of-each-line-tp32742979p32745047.html Sent from the Gnu - Bash mailing list archive at Nabble.com.
