How use more or less inside bash script - linux

Question

Okay, I have big list of servers and I wrote a bash script to enlist them. But the problem is that it scroll through the terminal.
I need a pagination view of those.
Is it possible to put more or less inside bash script?
say ,
1
.
.
.
1000
One page at a time.
I have this code:
Staging_Servers)
echo " Staging server list should go here"
;;
UAT_Servers)
echo " UAT server list should go here"
;;
Prod_Servers)
echo " Prod server list should go here"
;;
And one of them have long listing.
Once I run the script it shows menu like below:
1) Jenkin_Servers 5) Prod_Servers 9) DB-Staging
2) Nagios_Servers 6) Proxy_Servers 10) DB-Prod
3) Staging_Servers 7) Dedicated_Servers
4) UAT_Servers 8) Shared_Servers
Please enter the required number :
Okay once I give the number to the prompt one of the menu has lot of items which scroll of the screen. I want to see it by one page at a time.

Answer 1

Yes, you can invoke more or less in a bash script:
#!/bin/bash
...
cat file* | less
...
will start paginating output once it reaches the cat (or whatever command it is).
I used to write README files that had a first line consisting of:
#!/usr/bin/less
When you executed the README, it would paginate the README. Self paginating text files.

Answer 2

Store your server list in a string or array, and echo the output through your PAGER, or explicitly through less. For example:
export PAGER='/usr/bin/less'
case $list_name in
Staging_Servers)
echo "${staging_servers[#]}" | "$PAGER"
;;
UAT_Servers)
echo "${uat_servers[#]}" | "$PAGER"
;;
Prod_Servers)
echo "${prod_servers[#]}" | "$PAGER"
;;
esac