How to add iRules using CLI

I've done this same task with this script I've made. I add an iRule preserving all existing ones on the Virtual Server.

#!/bin/sh

# f5-irule-add - add iRule to a virtual server, preserving existing iRule configuration

# Gian Henriques, 30/06/2021

# hot to use: ./script.sh new_irule my_vs

# source: https://devcentral.f5.com/s/question/0D51T00006i7Y7R/add-irule-via-tmsh-without-deleting-existing-irules-and-how-to-reorder

virtual=$2

irule_add=$1

 #Capture existing iRule configuration

tmsh list ltm virtual ${virtual} one-line | grep -q " rules { "

if [ $? -eq 1 ]; then

  echo "$0: ${virtual} currently contains no rules; adding new rule"

  irule_current=""

else

  irule_current=`tmsh list ltm virtual ${virtual} one-line | sed -e 's/.* rules { //' -e 's/ }.*//'`

 #  Check if rule already exists

  exists=0

  for rule in ${irule_current}

  do

   if [ ${rule} == ${irule_add} ]; then

     exists=1

   fi

  done

  if [ ${exists} -eq 1 ]; then

   echo "$0: ${irule_add} already exists in virtual ${virtual}" >&2

   #exit 2

  else

  # Modify iRule list

command="tmsh modify ltm virtual ${virtual} rules { ${irule_current} ${irule_add} }"

echo ${command}

exec ${command}

status=$?

if [ ${status} -ne 0 ]; then

echo "tmsh returned error status ${status}" >&2

exit ${status}

fi

fi

fi