Help with variables in loop

Shell Programming and Scripting
1

Hello, please assist:

 users="test1 test2" 
 keytest1="abcd" 
 keytest2="dbcd" 

 for i  in $users 

 do 

echo "$key${i}" > fileout 

done

So, my objective is to take the current user (ie test1) in loop and echo its associated keyname (ie keytest1) variable to a file.
The echo redirecting value of keytest* to file.

Thanks

2

This can be achieved in standard shell (and all its derivates) with

users="test1 test2"
keytest1="abcd"
keytest2="dbcd"

for i in $users
do
 eval echo "\${key${i}}"
done

BTW eval - if a part of its arguments is imported - bares a security risk.
If you have bash, you can do

users="test1 test2"
keytest1="abcd"
keytest2="dbcd"

for i in $users
do
 key=key${i}
 echo "${!key}"
done

Or use arrays

users=(test1 test2)
key=(abcd dbcd)

index=0
for i in ${users[@]}
do
 echo "${key[$index]}"
 index=$((index+1))
done

Often you can organize your data in pairs,
and the shell can elegantly process them

user_keys="\
test1 abcd
test2 dbcd"

while read i key
do
 echo "${key}"
done <<< "$user_keys"

And a standard shell can run this as

user_keys="\
test1 abcd
test2 dbcd"

echo "$user_keys" |
while read i key
do
 echo "${key}"
done
3

I really appreciate the feedback.

Code#2 worked for me but I'm sure the others will also do the trick.

Thanks again!:):b: