Issue with a simple Bash Script for adding an iRule to a list of Virtual Servers.

Hello Community, 

I am having an issue with a bash script for an F5 BIG-IP Load Balancer, intended to read and iterate over a .txt list of Virtual Server names, look up the partition for a given VS, and add an iRule to it. When running the script I am only hitting the outermost 'else' statement for being unable to find the partition and VS name. My script logic is based on F5 Support solution K41961653:

<p>
#!/bin/bash

# Prompt the user for the iRule name and read it into the 'new' variable
echo "Please enter the iRule name:"
read new

noneRules='rules none'

while IFS= read -r vs_name; do
  # Retrieve the partition and virtual server name
  full_vs_info=$(tmsh -c "cd /; list ltm virtual recursive" | grep "$vs_name" | grep -m1 "^ltm virtual")
  echo "Full VS Info Debug: $full_vs_info"

  # Extract the partition and virtual server name from the retrieved information
  if [[ $full_vs_info =~ ltm\ virtual\ (.+)/(.+) ]]; then
    partition="${BASH_REMATCH[1]}"
    vs_name="${BASH_REMATCH[2]}"
    
    # Format the tmsh command to include the partition
    rule=$(tmsh list ltm virtual /$partition/$vs_name rules | egrep -v "\{|\}" | xargs)
    
    if [[ "$rule" == "$noneRules" ]]; then
      tmsh modify ltm virtual /$partition/$vs_name rules { $new }
      echo "iRule $new was added to $vs_name in partition $partition"
    else#
      tmsh modify ltm virtual /$partition/$vs_name rules { $rule $new }
      echo "iRules $rule were conserved and added $new to $vs_name in partition $partition"
    fi
  else
    echo "Could not find partition and virtual server name for $vs_name"
  fi
done < /shared/tmp/test_list.txt

tmsh save sys config
</p>

As far as I was able to troubleshoot, the problem I am encountering appears to be with line 11 of my script where I attempt to assign the string "ltm virtual SomePartition/VS_Example.com {" to the "full_vs_info" variable using:

full_vs_info=$(tmsh -c "cd /; list ltm virtual recursive" | grep "$vs_name" | grep -m1 "^ltm virtual")

When I run the tmsh command [tmsh -c "cd /; list ltm virtual recursive" | grep "VS_Example.com" | grep -m1 "^ltm virtual"] on its own, from the F5's Bash shell, I am getting the output I expect:

"ltm virtual SomePartition/VS_Example.com {"

However, when I run the script with the debug echo , it only outputs "Full VS Info Debug:", and ends the script with "Could not find partition and virtual server name for $vs_name" and a sys config save.

I am attempting to run this on a BIG-IP, version 15.1.10.2, build 0.44.2. 

I am quite new to both Bash scripting and F5 LBs. All feedback and criticism is highly appreciated! Thanks in advance!