How to do indirect variable evaluation

You can use bash indirect references for that:

AR1_p1=22
AR1_p2=23
AR1_p3=24
AR1_p4=25
for i in 1 2 3 4
do
  VARNAME="AR1_p${i}"
  echo "${!VARNAME}"
done

Per suggested comment(s), array should be used:

#!/bin/bash

AR1_p=(22 23 24 25)

for i in {1..4}
do
  echo "${AR1_p[$i-1]}"
done

This loop works. Else use Arrays.

$ for i in 1 2 3 4; do AR1_p1=22; AR1_p2=23; AR1_p3=24; AR1_p4=25; echo $((AR1_p$i)); done 
22
23
24
25

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