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How to read and write last modified timestamp to files?

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# 1  
Old 01-26-2014
How to read and write last modified timestamp to files?
Need help reading file last modified date in format:

Filename (relative path);YYYYMMDDHHMMSS

And then write it back. My idea is to backup it to a text file to restore later.


Checked this command but does not work:
Getting the Last Modification Timestamp of a File with Stat
Code:
$ stat -f "%Sm" -t "%Y%m%d_%H%M%S" filename.txt

Code:
stat: cannot read file system information for `%Sm': No such file or directory
stat: cannot read file system information for `%Y%m%d_%H%M%S': No such file or directory
filename.txt 6cf4032d 255 3e700ff 4096 4096 29171199 13977810 13977810 18446744073709551615 -1

Last edited by Tribe; 01-26-2014 at 06:29 AM..
# 2  
Old 01-26-2014
Here's one way to do it:
Code:
[user@host ~]$ date -d @$(stat -c%Y file) +"%Y%m%d%H%M%S"
20140118220547
[user@host ~]$

This User Gave Thanks to balajesuri For This Post:
Tribe
# 3  
Old 01-26-2014
You combined file and file system stat queries, which does not work. And you gave a format descriptor without the -c or --printf option (on top of the fact that there's no date/time info for file systems)
This User Gave Thanks to RudiC For This Post:
Tribe
# 4  
Old 01-26-2014
Quote:
Originally Posted by balajesuri
Here's one way to do it:
Code:
[user@host ~]$ date -d @$(stat -c%Y file) +"%Y%m%d%H%M%S"
20140118220547
[user@host ~]$

Quote:
Originally Posted by RudiC
You combined file and file system stat queries, which does not work. And you gave a format descriptor without the -c or --printf option (on top of the fact that there's no date/time info for file systems)
This example works perfectly on Cygwin, however it doesn't on android, where timestamps are always read and written in unix time from epoch.
# 5  
Old 01-26-2014
Quote:
Originally Posted by Tribe
This example works perfectly on Cygwin, however it doesn't on android, where timestamps are always read and written in unix time from epoch.
1. The %Y format specifier in stat -c command gives the time output in unix time from epoch.
2. I tried the command on Terminal IDE app (BusyBox v1.19.2) installed on my android phone (running Android v4.3) and it works just fine. Here's a screenshot.

How to read and write last modified timestamp to files?-terminalide_2014-01-27-06-25-09png
This User Gave Thanks to balajesuri For This Post:
Tribe
# 6  
Old 01-27-2014
Quote:
Originally Posted by balajesuri
1. The %Y format specifier in stat -c command gives the time output in unix time from epoch.
2. I tried the command on Terminal IDE app (BusyBox v1.19.2) installed on my android phone (running Android v4.3) and it works just fine. Here's a screenshot.

Attachment 5496
Code:
$ date -d @$(stat -c%Y file) +"%Y%m%d%H%M%S"
unknown option -- ddate: invalid option -d

Last edited by Tribe; 01-27-2014 at 03:26 AM..
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