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Recently, I noted that some directories of my server are cluttered with files like MbcYHt, KZDmv_, K40bS9, etc., i.e. always a filename of size 6 which seems to be base64 encoded. The file size is always zero.

Some more properties:

-rw-------  1 root root      0 Jan 24 20:00 X2OMrP
-rw-------  1 root root      0 Jan 20 13:00 XN2vPY
-rw-------  1 root root      0 Jan 24 08:00 Xu12IS
-rw-------  1 root root      0 Jan 24 11:00 XVHHvw
-rw-------  1 root root      0 Jan 14 13:00 Y2LyF0
-rw-------  1 root root      0 Jan 25 03:00 Yf8Cwq
-rw-------  1 root root      0 Jan 24 18:00 YJewCl
-rw-------  1 root root      0 Jan 25 08:00 YkEeUU
-rw-------  1 root root      0 Jan 14 10:00 ZPuqhb
-rw-------  1 root root      0 Jan 20 09:00 Zz0VWp

There are really many such files.

I wonder where they are coming from. I.e. if someone maybe recognize this and had some similar problems. Maybe that is some filesystem (ReiserFS) related problem. Or Gentoo/Portage specific (I run something like emerge --update --deep world automatically via cron every week.). Or maybe related to rsync (the whole filesystem is copied via rsync to some backup location every day). Or maybe related to Git (many directories are under Git version control).

Some directories where I found such files:

  • /
  • /scripts (custom directory with some user scripts, mostly Python)
  • /tmp
  • /var/tmp

(And I think some others, I partly deleted them already, I don't remember exactly anymore.)

Of course, maybe the most obvious reason is that some of the scripts in /scripts is messed up somehow and created them.

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