Changing a file's "Date Created" and "Last Modified" attributes to another file's
Solution 1
You can use the touch
command along with the -r
switch to apply another file's attributes to a file.
NOTE: There is no such thing as creation date in Unix, there are only access, modify, and change. See this U&L Q&A titled: get age of given file for further details.
$ touch -r goldenfile newfile
Example
For example purposes here's a goldenfile
that was created with some arbitrary timestamp.
$ touch -d 20120101 goldenfile
$ ls -l goldenfile
-rw-rw-r--. 1 saml saml 0 Jan 1 2012 goldenfile
Now I make some new file:
$ touch newfile
$ ls -l newfile
-rw-rw-r--. 1 saml saml 0 Mar 7 09:06 newfile
Now apply goldenfile
's attributes to newfile
.
$ touch -r goldenfile newfile
$ ls -l goldenfile newfile
-rw-rw-r--. 1 saml saml 0 Jan 1 2012 newfile
-rw-rw-r--. 1 saml saml 0 Jan 1 2012 goldenfile
Now newfile
has the same attributes.
Modify via Samba
I just confirmed that I'm able to do this using my Fedora 19 laptop which includes version 1.16.3-2 connected to a Thecus N12000 NAS (uses a modified version of CentOS 5.x).
I was able to touch a file as I mentioned above and it worked as I described. Your issue is likely a problem with the either the mounting options being used, which may be omitting the tracking of certain time attributes, or perhaps it's related to one of these bugs:
- Bug 461505 - can't set timestamp on samba shares
- Bug 693491 - Unable to set attributes/timestamps on CIFS/Samba share
Solution 2
Easiest way - accessed modified will be the same:
touch -a -m -t 201512180130.09 fileName.ext
Where:
-a = accessed
-m = modified
-t = timestamp - use [[CC]YY]MMDDhhmm[.ss] time format
If you wish to use NOW
just drop the t
and the timestamp
To verify they are all the same:
stat fileName.ext
See: touch man
Related videos on Youtube
Comments
-
eric moon over 1 year
I'm using merge cap to create a merge pcap file from 15 files. For the merged file, I have changed the name to that of the first of the 15 files. But I would also like to change the merged file's attributes like "Date Created" and "Last Modified" to that of the first one. Is there anyway to do this?
FILES_dcn=($(find $dir_dcn -maxdepth 1 -type f -name "*.pcap" -print0 | xargs -0 ls -lt | tail -15 | awk '{print $9}')) TAG1_dcn=$(basename "${FILES_dcn[14]}" | sed 's/.pcap//') mergecap -w "${dir_dcn}"/merge_dcn.pcap "${FILES_dcn[@]}" mv "${dir_dcn}"/merge_dcn.pcap "${dir_dcn}"/"${TAG1_dcn}".pcap
I try to access the merged files over a samba server (Ubuntu). So that an extractor function can access auto extract the files to D folder. But as the created date will be changed for the merged file the extraction fails. Is there anyway to fix this?
-
slm about 10 years@JishnuUNair - can you check to see how the Samba share is being mounted (with what options)? You can typically get these from the
mount
command and then look for the share you're accessing. Just a guess but it's likely being mounted use gvfs as a FUSE filesystem. -
Graeme about 10 yearsA lot of filesystems now support a file creation time. For ext4, you can view/change it through
debugfs
(although this needs root privileges and is no use here). See this question - unix.stackexchange.com/questions/50177/birth-is-empty-on-ext4 -
slm about 10 years@Graeme - yes I'd just referenced a similar method using stap: unix.stackexchange.com/questions/91197/… in the chatroom.
-
Lucky almost 10 yearsWhile Linux does not support a creation time, a Samba share can. Depending on how you set it up (and xattr support in the file system), Samba has the ability to store some time stamps in Linux xattrs. That means it may be able to do things that the underlying file system cannot - like report a valid (modifiable) creation time. Sorry, I didn't find any good links to how this works.
-
Jadeye over 8 yearsSomehow on ubuntu 14.04 putting
-a
before-m
does not modify access time...put it after, so:touch -m -a -t....
-
Jez about 7 yearsActually most Linux file systems (eg. ext4) now support creation date, and Linux 4.11 will have a
statx()
call to retrieve it. Finally. -
yurenchen over 6 years
-d time_string
maybe easier than-t
: -d "2004-02-29 16:21:42" -
Christopher almost 4 yearsCreation date is
Btime
in macOS (UNIX). -
Amin Seifi almost 3 yearsThis was a good thing, although the Internet is a place full of different ideas. @PatrickMevzek
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Arthur Bowers about 2 yearsWhat command did you run to get the info in the first screencap?
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DrBeco about 2 yearsWhen this site became a source of information for cheating teachers? We better have more noble objectives to aspire in life.