Using Sed to Delete Words in a File

Shell Programming and Scripting
1

This is a Nagios situation.

So i have a list of servers in one file called Servers.txt

And in another file called hostgroups.cfg, i want to remove each and every one of the servers in the Servers.txt file.

The problem is, the script I wrote is having a problem removing the exact servers in the Servers.txt file.

for EACH in `cat /var/home/me/Servers.txt`

do

cat /var/home/me/hostgroups.cfg | sed "s/$EACH//g" > /var/home/me/hostgroups.cfg1

cp /var/home/me/hostgroups.cfg1 /var/home/me/hostgroups.cfg2
cp /var/home/me/hostgroups.cfg1 /var/home/me/hostgroups.cfg

done

The hostgroups.cfg file often contains servernames with similar matching names and getting sed to remove JUST the server in the $EACH variable is another problem i keep encountering.

can someone please help me with this?

2

do you means your script will delete "are" and "hare" when you only want to delete "are"?
try the "\b" anchor,it match a whole word which is between two \b.
sed 's/\bABC\b//' will delete the ABC,not ABCD

3

for some bizarre reason, this isn't working.

4

Post an example of the file Servers.txt and the hostgroups.cfg file.

5

hostgroups.cfg:

There are several chunks similar to this in the hostgroups.cfg file.

define hostgroup {
      alias PRODUCTION
      hostgroup_name staged-hosts
      members     lht-rater-09.medy0.s.blah.net,db-tools-01.kedy0.s.blah.net,lhtgen-13.kedy0.s.blah.net,lhtgen-13.kedy0.s.blah.net,lhtgen-14.kedy0.s.blah.net,lhtgen-15.kedy0.s.blah.net,lhtgen-16.kedy0.s.blah.net,lhtgen-15.bedy0.s.blah.net,lhtgen-16.bedy0.s.blah.net,lhtgen-18.kedy0.s.blah.net,lhtgen-19.kedy0.s.blah.net,edge-evntpr-02.medy0.s.blah.net,edge-evntpr-04.medy0.s.blah.net,wifi-evntpr-01.vedy0.s,wifi-evntpr-02.vedy0.s,wifi-evntpr-03.vedy0.s,wifi-evntpr-04.vedy0.s,edge-evntpr-01.kedy0.s.blah.net,edge-evntpr-02.kedy0.s.blah.net,edge-tpr-03.kedy0.s.blah.net,edge-evntpr-04.kedy0.s.blah.net,edge-tpr-01.bedy0.s.blah.net,edge-evntpr-02.bedy0.s.blah.net,edge-tpr-03.bedy0.s.blah.net,edge-evntpr-04.bedy0.s.blah.net,edge-tpr-01.medy0.s.blah.net,edge-evntpr-03.medy0.s.blah.net
      use test-hostgroup
      }

Servers.txt:

edge-tpr-02.kedy0.s.blah.net
edge-tpr-03.kedy0.s.blah.net
edge-tpr-04.kedy0.s.blah.net
edge-tpr-01.bedy0.s.blah.net
edge-tpr-02.bedy0.s.blah.net
edge-tpr-03.bedy0.s.blah.net
edge-tpr-04.bedy0.s.blah.net
edge-tpr-01.medy0.s.blah.net
edge-evntpr-03.medy0.s.blah.net
6

Try this:

awk 'NR==FNR{a[$0]=$0; next}
/members/{
  for(i in a) {
    gsub(a"[,]*",x)
  }
  sub(",$",x)
}1' Servers.txt hostgroups.cfg