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Top Forums UNIX for Dummies Questions & Answers touch -t time, using different userid Post 302391635 by Perderabo on Tuesday 2nd of February 2010 04:55:48 AM
Old 02-02-2010
See my post: https://www.unix.com/tips-tutorials/1...rmissions.html
Last sentence:

Quote:
When the touch command is used to change the timestamps of an existing file, it invokes either the old utime() or the new utimes() system call. To change the timestamp on an existing file, you must own the file or be root. Also, you must have write permission on the file or be root.
 

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UTIME(3)						   BSD Library Functions Manual 						  UTIME(3)

NAME
utime -- set file times LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <utime.h> int utime(const char *file, const struct utimbuf *timep); DESCRIPTION
This interface is obsoleted by utimes(2). The utime() function sets the access and modification times of the named file from the actime and modtime fields of the struct utimbuf pointed at by timep. If the times are specified (the timep argument is non-NULL) the caller must be the owner of the file or be the super-user. If the times are not specified (the timep argument is NULL) the caller must be the owner of the file, have permission to write the file, or be the super-user. ERRORS
The utime() function may fail and set errno for any of the errors specified for the library function utimes(2). SEE ALSO
stat(2), utimes(2) STANDARDS
The utime() function conforms to IEEE Std 1003.1-1988 (``POSIX.1''). HISTORY
A utime() function appeared in Version 7 AT&T UNIX. BSD
June 4, 1993 BSD
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