How to search for a string in a text file and perform a specific action based on the result - bash

Question

I have very little experience with Bash but here is what I am trying to accomplish.
I have two different text files with a bunch of server names in them. Before installing any windows updates and rebooting them, I need to disable all the nagios host/service alerts.
host=/Users/bob/WSUS/wsus_test.txt
password="my_password"
while read -r host
do
curl -vs -o /dev/null -d "cmd_mod=2&cmd_typ=25&host=$host&btnSubmit=Commit" "https://nagios.fqdn.here/nagios/cgi-bin/cmd.cgi" -u "bob:$password" -k
done < wsus_test.txt >> /Users/bob/WSUS/diable_test.log 2>&1
This is a reduced form of my current code which works as intended, however, we have servers in a bunch of regions. Each server name is prepended with a 3 letter code based on region (ie, LAX, NYC, etc). Secondly, we have a nagios server in each region so I need the code above to be connecting to the correct regional nagios server based on the server name being passed in.
I tried adding 4 test servers into a text file and just adding a line like this:
if grep lax1 /Users/bob/WSUS/wsus_text.txt; then
<same command as above but with the regional nagios server name>
fi
This doesn't work as intended and nothing is actually disabled/enabled via API calls. Again, I've done very little with Bash so any pointers would be appreciated.

Answer 1

Extract the region from host name and use it in the Nagios URL, like this:
while read -r host; do
region=$(cut -f1 -d- <<< "$host")
curl -vs -o /dev/null -d "cmd_mod=2&cmd_typ=25&host=$host&btnSubmit=Commit" "https://nagios-$region.fqdn.here/nagios/cgi-bin/cmd.cgi" -u "bob:$password" -k
done < wsus_test.txt >> /Users/bob/WSUS/diable_test.log 2>&1