bash concatenate randomized strings to current list of strings

Here is one idea.

Expected array output is like foo:a6f bar:0o0 baz:5!3 ....

#!/usr/bin/env bash

array=(foo bar baz lorem ipsum)

for i in "${array[@]}"; do
  IFS= read -r rand < <(openssl rand -hex 3) &&
  new_array+=("$i":"$rand")
done

printf '%s\n' "${new_array[*]}"

I'm passing this array to another bash script by appending a random password from output of openssl rand -hex 3

Using a separate script and feeding the array.

The script named myscript

#!/usr/bin/env bash

new_array=()

for f ; do
  IFS= read -r rand < <(openssl rand -hex 3) &&
  new_array+=("$f":"$rand")
done

printf '%s\n' "${new_array[*]}"

At the command line.

initialize the array of strings.

array=(foo bar baz lorem ipsum)

Feed it against myscript.

myscript "${array[@]}"

Not sure how you would incorporate the code above in your script though, since we don't know where are the strings is coming from.