Combining tail and sed command and redirecting them to new file

Question

I am connecting to multiple remote servers and displaying there log files by using tail command to local system. As all the log files are generating dynamically we are not able to differentiate them. So I am thinking to redirect log file and serevrid to each line of log file to other temporary file and then will tail temporary file, so that on local machine we can differentiate different servers log file.

I am using

(sed -e '/s/^/192.168.12.1' /logs/a.log; tail -f /logs/a.log) > b.log
tail -f b.log

but now only few starting lines are getting updated with serverid and not all lines after dynamically generating. So kindly tell me how to concatenate serverid with each line of log file.

Answer 1

I got the answer. I am getting my pattern by using code as:

tail -f '/logs/alog' | sed 's/^/'192.168.12.1'/' >> b.log
tail -f b.log

Answer 2

sed --unbuffered -e 's/^/192.168.12.1/' /logs/a.log >> b.log
tail -f b.log

should be enough if you want a file but a simple

sed --unbuffered -e 's/^/192.168.12.1/' /logs/a.log 

will work normaly