I would like to learn more about how file access time and file modification time related to directory access and modification times.
I did read the "questions allowed here" but if there is a better StackExchange site for this question please let me know. This is not an Ubuntu system so askubuntu.com is out.
- Redhat Enterprise Linux 5.5.56. No we can't upgrade, please do not ask about that.
- I try to stick with bash.
- find version 4.2.27
Problem: I want to make a bash script where, starting in the current directory where the script is run, I want to list directories and subdirectories that have not been modified for at least 300 days. These directories that I'm checking for contain files that MIGHT be have a modification time later than the directory modification time. I want to list only directory names that contain 'JOB' but not 'DIV', case sensitive.
Note: Our directories are arranged like this: CLS_xxx dirs will contain many GRP_xxx dirs. GRP_xxx dirs will contain many JOB_xxx dirs. JOB_dirs might contain many DIV_xxx dirs. So while I might be in the dir that contains all the CLS dirs, I only want to show dirs that contain JOB.
/path/to/containerdir/ CLS_xxx/ GRP_xxx/ JOB_xxx/ Files under here might be modified later than the JOB_xxx dir. DIV_xxx/ files under DIV/ might be modified later than the JOB_xxx dir.
Clear as mud? :)
- If a file is modified inside a directory, called JOB_1234, how does that affect the directory modification time?
- Does changing a file affect the directory access time? Should I be using directory access time with find?
- Is there even a switch for directory access time because I didn't see one in the man page my system has.
- At what point is the directory mod time changed? When we change permissions on it? Change owners or group? Anything else?
- When is the directory access time changed? When a file inside the dir is accessed or changed?
I was reading the man page for find but didn't find my answer. I also read about 8 pages from my Google search about
find and didn't find my answer there either.
This command works fine for finding directory mod times > 300 days.
find . -type d -print -mtime +300 | grep -v 'DIV' | grep -P 'JOB' | sort > $outfile
But my question is more around, what if files inside the dir were modified more recently? Given a dir that starts with JOB_, how can I find the most recent file or dir modification time of each JOB_ dir and the files within that JOB_ dir?