Is it possible to detect the files in a folder that have changed their permissions? I have read about the command find and It detects files that have changed the date of last modification but changing permissions does not change this date.
Detect changes in permissions
permissions
Check out the stat command, this shows 3 times the last time the file was accessed, when it was last modified and when it's permissions were last changed.The one which you're interested in is permissions (change), see the below output for an example file I have just chmod'ed;prompt::11:26:45-> stat ideas.md   File: ideas.md  Size: 594         Blocks: 8          IO Block: 4096   regular fileDevice: 27h/39d Inode: 117         Links: 1Access: (0770/-rwxrwx---)  Uid: (    0/    root)   Gid: (  992/  vboxsf)Context: system_u:object_r:vmblock_t:s0Access: 2014-12-21 19:15:29.000000000 +0000Modify: 2014-12-21 19:15:29.000000000 +0000Change: 2014-12-22 11:26:45.000000000 +0000 Birth: -Or as @0xC0000022L says you could use stat -c to show just the output you need;prompt::11:32:46-> stat -c %z ideas.md 2014-12-22 11:26:51.000000000 +0000