you are in luck, I developped a script with clapi for that a while ago, use it at your own risk

(I make this kind of script as I don’t like using my login and password in the bash command line)

#!/bin/bash

read -p "Enter Username: " CENTUSER
read -s -p "Enter Password: " CENTPASS
echo
export CENTUSER=$CENTUSER
export CENTPASS=$CENTPASS


IFS=$'\n' my_hosts=( $(centreon -u $CENTUSER -p "$CENTPASS" -o HOST -a show) )
nbhost=${#my_hostst@]}

for host in "${my_hostst@]}:1"
do
  HOST=$( echo ${host} | awk -F  ";" '{print $2}' )
  ALIAS=$( echo ${host} | awk -F  ";" '{print $3}' )

  NEWHOST=${HOST^^}
  NEWALIAS=${ALIAS^^}


  echo "$HOST ==> $NEWHOST ; $ALIAS ==> $NEWALIAS"

  #centreon -u $CENTUSER -p "$CENTPASS" -o HOST -a setparam -v "${HOST};alias;${NEWALIAS}"
  #centreon -u $CENTUSER -p "$CENTPASS" -o HOST -a setparam -v "${HOST};name;${NEWHOST}"

done

run it as is, it will show you the new name and alias on the console. 

if you are satisfied with the output, remove the comment on the last 2 lines

it will set the new alias and the hostname in uppercase, using the bash syntax ^^ so PLEASE PARSE THE OUTPUT BEFORE REMOVING COMMENT (I have no idea how it behaves with strange characters)

if you don’t want to change the alias and just the hostname, leave the first comment with NEWALIAS

(worked on centreon 19.x and still work on 22.04)

Many thanks