Notwithstanding the lowest-level function open() working that way (and it’s honestly a somewhat different situation due to what it is and what the flags all are

Notwithstanding the lowest-level function open() working that way (and it’s honestly a somewhat different situation due to what it is and what the flags all are), fopen(), the more user-friendly interface with its mode strings, has "w" equivalent to including O_TRUNC in open() flags: https://man7.org/linux/man-pages/man3/fopen.3.html https://man7.org/linux/man-pages/man3/fopen.3.html