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Full Discussion: CRON Job
Top Forums Shell Programming and Scripting CRON Job Post 302534134 by 2scoops on Monday 27th of June 2011 04:37:34 AM
Old 06-27-2011
CRON Job

Hi all,

Pretty new to CRON but have been messing with Ubuntu for a while now
Here is the situation/problem I have run into you.

I currently run a very basic back procedure by executing a daily CRON job which copies all data from one directory to a USB drive & date stamps the copy:-

Code:
cp -r /var/ /media/USB$(date +/%F)

Which has been working prefectly well, however when I checked it last I realised the USB drive had filled up & there was no space to continue the backup.

Is there an easy way to check the date & overwrite the oldest copy, therfore never filling the drive up so the backup will always be successful.

Thanks for looking
2scoops

Last edited by pludi; 06-27-2011 at 07:08 AM..
 

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sa2(8)							    BSD System Manager's Manual 						    sa2(8)

NAME
sa2 -- Generate a system activity daily report file. SYNOPSIS
/usr/lib/sa/sa2 [-dgpu] [-n mode] [-e time] [-f filename] [-i seconds] [-s time] DESCRIPTION
The sa2 command is a shell script used to invoke the system activity reporter sar for purposes of generating the standard default daily report file. The report file generated is, /var/log/sa/sardd where the dd represents the current day of the month. The sa2 options are the same as those documented in sar(1). When sa2 runs, it will also remove data and report files, found in /var/log/sa, that are more than one week old. The sa2 command is intended to be started by cron. EXAMPLE CRON ENTRY
# Starting at 8am collect system activity records # every 20 minutes for 12 hours # 20 minutes = 1200 seconds # 12 hours with 3 samples each hour = 36 loops 0 8 * * 1-5 /usr/lib/sa/sa1 1200 36 # After the 12 hour period, # collect a system activity report 30 20 * * 1-5 /usr/lib/sa/sa2 -A FILES
/var/log/sa/sardd Default daily report file. /var/log/sa/sadd Default daily data file. dd are digits that represent the day of the month. SEE ALSO
sa1(8), sadc(8), sar(1), iostat(8), vm_stat(1), netstat(1), top(1), sc_usage(1), fs_usage(1), crontab(1), crontab(5) Mac OS X Jul 25 2003 Mac OS X
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