in linux terminal, how do I show the folder's last modification date, taking its content into consideration?

Question

So here's the deal. Let's say I have a directory named "web", so

$ ls -la  drwx------  4 rimmer rimmer 4096 2010-11-18 06:02 web 

BUT inside this directory, web/php/

$ ls -la  -rw-r--r-- 1 rimmer rimmer 1957 2011-01-05 08:44 index.php 

That means that even though the content of my directory, /web/php/index.php has been last modified at 2011-01-05, the /web/ directory itself is reported as last modified at 2010-11-18.

What I need to do is have my /web/ directory's last modification date reported as the latest modification date of any file/directory inside this directory, recursively.

How do I go about doing this?

Answer 1

Something like:

find /path/ -type f -exec stat \{} --printf="%y\n" \; |       sort -n -r |       head -n 1 

Explanation:

• the find command will print modification time for every file recursively ignoring directories (according to the comment by IQAndreas you can't rely on the folders timestamps)
• sort -n (numerically) -r (reverse)
• head -n 1: get the first entry

Answer 2

If you have a version of find (such as GNU find) that supports -printf then there's no need to call stat repeatedly:

find /some/dir -printf "%T+\n" | sort -nr | head -n 1 

or

find /some/dir -printf "%TY-%Tm-%Td %TT\n" | sort -nr | head -n 1 

If you don't need recursion, though:

stat --printf="%y\n" *