06-13-2012
I need to preserve old modification time, at least in those cases that nothing is changed. Both Windows and openSuse shows new modification timestamps for all .m files.
I guess it's that sed parameter '-i' (in-place edit) that makes this happen? But it's so cute parameter in this case
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LEARN ABOUT LINUX
futimes
FUTIMES(3) Linux Programmer's Manual FUTIMES(3)
NAME
futimes, lutimes - change file timestamps
SYNOPSIS
#include <sys/time.h>
int futimes(int fd, const struct timeval tv[2]);
int lutimes(const char *filename, const struct timeval tv[2]);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
futimes(), lutimes(): _BSD_SOURCE
DESCRIPTION
futimes() changes the access and modification times of a file in the same way as utimes(2), with the difference that the file whose time-
stamps are to be changed is specified via a file descriptor, fd, rather than via a pathname.
lutimes() changes the access and modification times of a file in the same way as utimes(2), with the difference that if filename refers to
a symbolic link, then the link is not dereferenced: instead, the timestamps of the symbolic link are changed.
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS
Errors are as for utimes(2), with the following additions for futimes():
EBADF fd is not a valid file descriptor.
ENOSYS The /proc file system could not be accessed.
VERSIONS
futimes() is available since glibc 2.3. lutimes() is available since glibc 2.6, and is implemented using the utimensat(2) system call,
which is supported since kernel 2.6.22.
CONFORMING TO
These functions are not specified in any standard. Other than Linux, they are only available on the BSDs.
SEE ALSO
utimensat(2), utime(2), symlink(7)
COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2008-04-07 FUTIMES(3)