As of mid-day Saturday, Oct. 26, here is what '/' filesystem space use looks like on this work station:
===============
bash.2[/]: df -hP
Filesystem      Size  Used Avail Use% Mounted on
tmpfs           7.8G  1.7M  7.8G   1% /run
/dev/sda6        50G   24G   23G  52% /
/dev/sda7       904G  7.6G  851G   1% /home
/dev/sda3       477M  237M  211M  53% /boot
[6 others, each using < 1M]
-----
bash.3[/]: du -hx -d1 /
6.1G    /var
17G     /usr
51M     /etc
1.4G    /root
238M    /opt
[7 others, each using < 1M]
24G     /
bash.4[/]:
-----
bash.7[/]: du -hx -d1 /var
3.7G    /var/cache
847M    /var/spool
565M    /var/lib
1.1G    /var/log
[16 others, each using < 1M]
6.1G    /var
bash.8[/]:
-----
bash.8[/]: du -hx -d1 /var/cache
8.0K    /var/cache/abrt-di   (left in to show results)
144M    /var/cache/PackageKit
44M     /var/cache/cups
2.9G    /var/cache/system-upgrade
6.7M    /var/cache/man
501M    /var/cache/dnf
60M     /var/cache/akmods
2.2M    /var/cache/app-info
[15 others, each using < 1M]
3.7G    /var/cache
bash.9[/]:
-----
bash.9[/]: du -hx -d1 /var/log
1.8M    /var/log/anaconda
2.8M    /var/log/ConsoleKit
873M    /var/log/journal
1.2M    /var/log/gdm
20M     /var/log/rkhunter
40M     /var/log/audit
9.7M    /var/log/upgrade.journal
2.3M    /var/log/boot-sav
[17 others, each using < 1M]
1.1G    /var/log
bash.10[/]:
-----

Question 1:
/var/cache/system-upgrade/updates/packages/ takes up 1.6G and appears to be full of rpm's (1083 of them), each dated 2015 (various months).  I do not know the fine details of dnf and rpm.  Can I safely delete them, or might that break future patching and upgrading, and other dnf/rmp commands?

Question 2:
/var/log/ has 193 files that are not sub-directories, and are not stored in sub-directories.  134 are from prior years. Curious: all 134 are from 2016 or earlier; this directory has no files from 2017 or 2018.  The files called "messages-[date]" are huge: each over 10M.  Can I delete files older than this year safely, or are they needed for something?

Question 3:
/var/log/rkhunter/ has 184 files, most are from prior years.  Am I correct in assuming that I can delete the files from prior years?

Question 4:
Is there already available some automated deletion of /var/log/ logs (and its sub-directories other than "journal")?

Question 5:
Are there any other parts of the '/' filesystem that I should clean out and are worth the trouble?

thanks,
Bill.
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