$ ./working --create_dir --target_dir my_foo
$ cd my_foo && ls -labhrt | tail -n 1000 | head -n 10
---S-ws--x  1 User Group 27 Feb 17 23:29 06031_--S-ws--x.txt
---S-ws-w-  1 User Group 27 Feb 17 23:29 06032_--S-ws-w-.txt
---S-ws-wx  1 User Group 27 Feb 17 23:29 06033_--S-ws-wx.txt
---S-wsr--  1 User Group 27 Feb 17 23:29 06034_--S-wsr--.txt
---S-wsr-x  1 User Group 27 Feb 17 23:29 06035_--S-wsr-x.txt
---S-wsrw-  1 User Group 27 Feb 17 23:29 06036_--S-wsrw-.txt
---S-wsrwx  1 User Group 27 Feb 17 23:29 06037_--S-wsrwx.txt
---Sr-S---  1 User Group 27 Feb 17 23:29 06040_--Sr-S---.txt
---Sr-S--x  1 User Group 27 Feb 17 23:29 06041_--Sr-S--x.txt
---Sr-S-w-  1 User Group 27 Feb 17 23:29 06042_--Sr-S-w-.txt