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lang-bash
tee /dev/fd/1, but that doesn't work because the output still gets captured by$(). So in case anyone else is wondering the same thing, it is necessary to use an extra file descriptor (like 5).exec:{ FF=$(echo aaa|tee /dev/fd/5); } 5>&1The braces allow for the redirection to happen before the subshell command is run, while$FFstill remains in the scope of the current shell (that wouldn't work with normal brackets(). This way there's even no need to close FD 5 afterwards, which is a overlooked hygienic habit.sudo -u <other non-root user> <script>then Op De Cirkel's answer works but this answer does not. Writing to /dev/fd/5 is equivalent to writing directly to the terminal. /dev/fd/5 is a symlink to the /dev/pts/ file for the terminal, which is owned by the user that originally logged in and is not writable by the sudo'd user. However,cat - >&5writes to a file descriptor that is opened by bash within the process (which is not the same as writing to /dev/fd/5). This file descriptor forwards the write through each parent process, avoiding any permissions issues.