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#include <unistd.h> off_t lseek(int fd, off_t offset, int whence);
This function moves the file pointer for fd according to mode:
SEEK_SET
SEEK_CUR
SEEK_END
The new offset is returned.
not ANSI, POSIX
lseek(fd, 12, SEEK_CUR); /* skip 12 bytes */
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