05-31-2007
/var/spool is a link of /usr/spool, email and print files are all temporarily stored below this directory.
/var/opt is the location of the operating system files, /usr/bin /bin /etc are all links to something within /var/opt.
You should, by definition, be able to delete all the files in /tmp, and, in fact, in SCO 6.0.0 and Unixware, /tmp can be a ramdrive...but, I would make a copy of it, say "tar ctvf /u/tmp.tar /tmp" before deleting it the first time.
There are hard links, and soft(symbolic) links. There is no way to tell which is the original and which is the link with a hard link, so deleting one will delete both.
With soft links, the original file will still exist if the link (newer file) is deleted. See "man ln".
It doesn't matter which file name you use to truncate the file.
/usr/spool/mail/cron will only exist if you have cron jobs (typically scheduled overnight batch jobs) running.
If you are using mail on this system, you should move all the contents of /usr/spool/mail to /u/spool/mail, and then edit /usr/mmdf/mmdftailor and change the location of the spool files accordingly. Doing this will prevent someone from filling the root file system with email messages.
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ATD(8) Linux Programmer's Manual ATD(8)
NAME
atd - run jobs queued for later execution
SYNOPSIS
atd [-l load_avg] [-b batch_interval] [-d] [-s]
DESCRIPTION
atd runs jobs queued by at(1).
OPTIONS
-l Specifies a limiting load factor, over which batch jobs should not be run, instead of the compile-time choice of 0.8. For an SMP
system with n CPUs, you will probably want to set this higher than n-1.
-b Specifiy the minimum interval in seconds between the start of two batch jobs (60 default).
-d Debug; print error messages to standard error instead of using syslog(3).
-s Process the at/batch queue only once. This is primarily of use for compatibility with old versions of at; atd -s is equivalent to
the old atrun command. A script invoking atd -s is installed as /usr/sbin/atrun for backward compatibility.
WARNING
atd won't work if its spool directory is mounted via NFS even if no_root_squash is set.
FILES
/var/spool/at The directory for storing jobs; this should be mode 700, owner daemon.
/var/spool/at/spool The direcotry for storing output; this should be mode 700, owner daemon.
/etc/at.allow, /etc/at.deny determine who can use the at system.
SEE ALSO
at(1), atrun(1), cron(8), crontab(1), syslog(3), at.deny(5), at.allow(5).
BUGS
The functionality of atd should be merged into cron(8).
local Mar 1997 ATD(8)