help needed with shell script to append to the end of a specific line in a file on multiple servers

Shell Programming and Scripting
1

Hi Folks,

I was given a task to append three IP's at the end of a specific (and unique) line within a file on multiple servers.

I was not able to do that with the help of a script. All I could was:

for i in server1 server2 server3 server4
do
ssh $i
done

I know 'sed' could be used to append to the end of the line but how to save that and replicate on all servers in the list?

Original File
-----------

#cat /etc/ftpd/ftpaccess
greeting brief
log commands
log transfers
class users real 172.25.6.148 172.25.197.148 172.25.52.100 172.21.56.75 172.21.54.159 172.25.2.25 172.25.2.26 172.25.119.132 172.25.119.133 172.25.119.134 172.25.119.135 172.25.183.132 172.25.183.133 172.25.183.134 172.25.183.135
banner /etc/ftpd/banner.txt

(each server had different IP's in the line starting with: class
users real .....):

Change required:
----------------

Append "172.21.105.99 172.21.105.100 172.21.105.101" at the end of line starting with text:'class users real')

Any help will be appreciating in how would you gurus would accomplish this task with the help of a script / scripted-command.

Thanks in advance

2

Not sure I understand, but this might work if I do.

for i in server1 server2 server3 server4; do
    ssh $i "sed -i 's/\$/ 172.21.105.99 172.21.105.100 172.21.105.101/' file.txt"
done

Note: the backslash protects the dollar sign from the local shell. When it arrives on the remote server, it's in single quotes. The double quotes and backslash have been removed.

3

this will append the ip address in all the lines.

4

Oops. I left off the address.

for i in server1 server2 server3 server4; do
    ssh $i "sed -i '/class users/s/\$/ 172.21.105.99 172.21.105.100 172.21.105.101/' file.txt"
done
5 
ssh $i "sed -i ' /^class users real/ s/\$/ 172.21.105.99 172.21.105.100 172.21.105.101/' file.txt"
6

Thanks for both the replies and making it work for me!
Salute! :b: