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UTIME(2) System Calls Manual UTIME(2)

utime - set file times

#include <sys/types.h>
utime(file, timep)
char *file;
time_t timep[2];

The utime call uses the `accessed' and `updated' times in that order from the timep vector to set the corresponding recorded times for file.

The caller must be the owner of the file or the super-user. The `inode-changed' time of the file is set to the current time.

stat (2)

(utime = 30.)
sys utime; file; timep

UNIX-7