eval "$(
    # This subshell take the output of env, quotes it properly, and shoves it
    # onto one line.
    printf export\\t
    env |
        while read -r l; do
            printf %s\\n "$l" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/'/"
        done |
        paste -s -d ' '
)"