Bash reexport

reexport.sh

#!/bin/bash -

declare -A before
while read linia; do
    key=${linia%=*}
    value=${linia#*=}
    before+=(["$key"]="$value")
done < <(export -p | cut -d' ' -f3-)

. original.script.sh

declare -A after
while read linia; do
    key=${linia%=*}
    value=${linia#*=}
    after+=(["$key"]="$value")
done < <(export -p | cut -d' ' -f3-)


declare -A difference
for k1 in "${!after[@]}"; do
    skip=
    for k2 in "${!before[@]}"; do
        if [[ "${before[$k2]}" == "${after[$k1]}" ]]; then
            skip=1;
            break;
        fi
    done
    [[ -n "$skip" ]] || difference+=([$k1]=${after[$k1]})
done

set -x
for k3 in ${!difference[@]}; do
    export $k3="${difference[$k3]}"
done