Script to remove line of text

Shell Programming and Scripting
1

Hello,
I have a line that needs to be removed using sed -i to perform the replace in place. The issue that I have is the files on each server may contain extra rows after the last logger definition. So I can't count accurately from the last row.
So from the example the line that contains @watchdog could have 5 blank lines under it or 3.

TEXT:

# Save boot messages also to boot.log
local7.*                                                /var/log/boot.log

local1.*                                                /var/log/prod/prod.log
local1.*                                                @sysmon
local1.*                                                @watchdog

DESIRED RESULTS:

# Save boot messages also to boot.log
local7.*                                                /var/log/boot.log

local1.*                                                /var/log/prod/prod.log
local1.*                                                @watchdog

The line that contained @sysmon is gone in the desired results.

Thanks,
jaysunn

2

So do you want to simply eliminate the "@sysmon" line...in place that is

3

More details please. What criteria is used to decide which row is to be deleted? You've told us what criteria to not use...

4

How about simply deleting all blank lines...and not worrying about only those that are at the tail end.

5

Hi,
try

6

Thanks for helping!!
@shamrock,
Yes I just want to remove the line that contains "@sysmon".

I am sorry for wasting every ones time. After thinking about "More Criteria" that @Corona688 suggested. I think I can get away just fine with the following code below, since the row containing @sysmon is always the same. It may be at a different line number in the file, but the same. Also I am sure much more elegant solutions exist.

[root@server ~]# sed 's/local1.*                                                @sysmon//' /etc/syslog.conf

The command above does remove the line that I wanted removed.
Thanks for helping me think on my own. :b:
jaysunn

7

You can try this ex script for in place substitution...

ex -s +'/@sysmon$/d | wq' file
8

@shamrock,
Very neat ex script. What seems to happen is I got dropped into VI when running this. I need to then :q to get out.

ex -s +'/@sysmon$/d | wq' /etc/syslog.conf

Thanks,
jaysunn

9

That should not happen...that is what the wq command is supposed to take care of...in red above