Shell: How to append a prefix while looping through an array?

Question

I'm trying to loop through an array and append a prefix to each value in the array. Simplified version of the code:

#!/bin/sh
databases=( db1 db2 db3 )
for i in live_${databases[@]} stage_${databases[@]}
do
    ....
done

However, it only prepends the prefix to the first value in the array - the values it loops through are:

live_db1 db2 db3 stage_db1 db2 db3

Any thoughts? Thanks.

Answer 1

databases=( db1 db2 db3 )
for i in ${databases[@]/#/live_} ${databases[@]/#/stage_}
do
    ....
done

Answer 2

Try something like this:

#!/bin/sh
databases="db1 db2 db3"
for i in $databases
do
    x="live_$i"
    y="stage_$i"
    echo "$x $y"
done