Editing Virtual server IPs via script

I'm having trouble with this one. Maybe it's because I'm running version 11.5.1. Here's what I did:

1. Created a file named bash.sh in the /shared folder.
2. Ran the following command: chmod 755 /shared/bash.sh
3. Ran the following command: bash /shared/bash.sh

The output looked correct, the desired octet was changed:

modify ltm virtual vs-name { destination 10.10.207.x:80 }

But, the actual VS destinations were not changed. Below is the contents of the bash.sh file:

!/bin/bash

tmsh list ltm virtual destination | tr '\n' ' ' \
| sed 's/ \+/ /g;s/ltm virtual/\nmodify ltm virtual/g;s/nation 10\.10\.206/nation 10.10.207/g';echo