Sebastian Huber commented on a discussion on cpukit/libmisc/shell/shell.c: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/300#note_114747

 >        return false;
 >      }
 >      /* Make a raw terminal, Linux Manuals */
 > -    if (tcgetattr(fileno(stdin), &previous_term) >= 0) {
 > +    if ((tc_result = tcgetattr(fileno(stdin), &previous_term)) >= 0) {

According to the man page, `tcgetattr()` and `tcsetattr()` return `0` on 
success. So, the check should be changed accordingly.

-- 
View it on GitLab: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/300#note_114747
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