printf '#include <stdio.h>\n#include <time.h>\nint main() { printf("time_t is %%zu-bit\\n", sizeof(time_t)*8); }\n' | gcc -x c -o timesize - && ./timesize && rm

printf '#include <stdio.h>\n#include <time.h>\nint main() { printf("time_t is %%zu-bit\\n", sizeof(time_t)*8); }\n' | gcc -x c -o timesize - && ./timesize && rm ./timesize If you're wondering about a specific distro that you're not using right now - just look it up.