03-11-2008
It's because it's subtracting one number from the other. The subtraction you're doing has no concept of dates.
There are many ways to go about this. What exactly are you trying to do?
A couple of possibilities:
A find command using the -mtime and -exec options (you can search for all files over 30 days old and do something to them).
A short script which returns the difference in days between a file's last-modified time and the current system time, to be embedded in your script.
As usual, providing as much information as possible will get you the best results. Also, try searching this site -- your question has probably been answered many times. It depends on exactly what you're trying to do.
ShawnMilo
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FAXCRON(8C) FAXCRON(8C)
NAME
faxcron - HylaFAX routine maintenance script
SYNOPSIS
/usr/sbin/faxcron [ -n ] [ -l lastrun ]
DESCRIPTION
faxcron is a command script that does routine upkeep tasks in a HylaFAX spooling directory hierarchy. This script is intended to be
invoked from cron(8C) on behalf of the fax user (often the ``fax'' user is uucp) once a day, with the standard output sent by mail to the
HylaFAX administrator. For example, the following crontab might be set up for the fax user:
25 23 * * * sh /usr/sbin/faxcron | mail FaxMaster
The faxcron script does the following work:
o report statistics for facsimile transmitted since the last time faxcron was run.
o report statistics for facsimile transmitted in the past week.
o report statistics for facsimile received since the last time faxcron was run.
o report statistics for facsimile received in the past week.
o report any recent calls that failed suspiciously and return the associated trace log;
o purge data that is 30 days or older from the remote machine information directory;
o delete information that is 30 days or older from session trace log files;
o remove files from the tmp directory that are older than 1 day;
o remove files in the received facsimile queue that are 7 days or older;
o report sites that are currently having jobs rejected; and
o force all session log files to be owned by the fax user and kept with protection mode 644.
OPTIONS
-n Forces faxcron to run without updating any files.
-l lastrun
Forces the notion of the last time that faxcron was run to be lastrun. The value of lastrun is a date and time string of the
form ``MM/DD/YY HH:MM'' (the date(1) format string ``%D %H:%M'').
-info n Set the expiration time for data in the info database to be n days.
-log n Set the expiration time for session log data to be n days.
-rcv n Set the expiration time for files in the received facsimile queue to be n days.
-tmp n Set the expiration time for files in the tmp directory to be n days.
-mode m Set the file protection mode for session logs to m (a command line argument to chmod(1)).
NOTES
This script requires nawk(1) or gawk(1) and a date(1) program that supports the ``+format'' option.
If session logs are to be kept private this script must be modified to filter out sensitive information such as calling card numbers. (It
should also be run with ``-mode 0600'' so that session log files are not publicly readable.)
FILES
/var/spool/fax spooling area
/var/spool/fax/etc/lastrun timestamp of last run
/usr/sbin/xferfaxstats for generating transmit statistics
/usr/sbin/recvstats for generating receive statistics
/var/spool/fax/tmp/faxcronXXXX temporary file for truncating session logs
/var/spool/fax/tmp/faxlogXXXX temporary file for logs of failed calls
SEE ALSO
cron(8C), faxq(8C), faxgetty(8C), faxsend(8C), xferfaxstats(8C), recvstats(8C), hylafax-server(5F)
May 12, 1996 FAXCRON(8C)