Shell: How to add a prefix during a loop through an array?

Question

I am trying to loop through an array and add 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 adds a prefix to the first value in the array - the values ​​it executes are as follows:

live_db1 db2 db3 stage_db1 db2 db3

Any thoughts? Thank.

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

Answer 3

for i in $( for d in ${databases[@]}; do echo "live_$d stage_$d"; done )
do
    ....
done

Answer 4

. :

bash man page → →

... #, ....