07-04-2008
The arithmentic on the dates will give you grief in the final "grep". Where hours and/or minutes fields are less than value 10, you will then need to convert integers with no leading zeros to strings with leading zeros.
If your intention is to find all entries in the log between two times (hour and minute on the same day) inclusive, the value of $z needs to be incremented by one.
The seconds fields ($s and $s1) appear to be surplus - the script as presented only needs the start and end times in hours and minutes.
I guess that "seq" is a program or enhanced shell function to generate numbers in a range. It is not a Bourne or Korn shell function. Beware that you could easily generate a command line which is too long by this method.
Alternative?
You could restructure the script to not do arithmetic on dates. Consider this simple example script "test2.sh" to process file "test2.txt" to extract lines between 0201 and 0203 inclusive using only character strings:
=======
test2.txt
=======
0101
0102
0103
0201
0202
0203
0301
0302
0303
======
test2.sh
======
cat test2.txt|while read MMDD
do
if [ "${MMDD}" -ge "0201" -a "${MMDD}" -le "0203" ]
then
echo "${MMDD}"
fi
done
=======
Execution
=======
# . ./test2.sh
0201
0202
0203
This method still needs enhancement to prevent false matches from grep when there is more than the 4 characters on a line! The exact layout of the logfile records and the position of the date on each line will dictate how write a script to do this match.
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LEARN ABOUT DEBIAN
atsadc
ATSADC(1) local ATSADC(1)
NAME
atsadc, atsa1, atsaftp, atsahttp -- counter-collection
SYNOPSIS
atsadc [ t n ] [ ofile ]
atsa1 [ t n ]
atsaftp
atsahttp
DESCRIPTION
System activity-data can be gathered on special request of a user [see atsar(1) ] or automatically, on a routine basis, as described here.
Usually the kernel maintains statistical counters that are incremented as various system actions occur. These include counters for CPU uti-
lization, disk utilization, memory utilization and various network statistics.
The program atsadc and the shell-script atsa1 are used to collect, save, and process these counters.
The program atsadc (the data collector) samples system data n times with an interval of t seconds between samples, and writes in binary
format to ofile or (default) to standard output. The sampling interval t should be greater than 1 second. If t and n are omitted, a special
reset-record is written. This facility is used when booting to a multi-user state, to mark the time at which the counters restart from
zero. For example, the reset-mark can be added to the daily data by the command:
/usr/local/bin/atsadc /var/log/atsar/atsa`date +%d`
Note that this entry is written to the /etc/rc.d/init.d/atsar file.
The shell-script atsa1 is used to collect and store data in the binary file /var/log/atsar/atsadd where dd is the current day of the month.
The arguments t and n cause records to be written n times at an interval of t seconds, or once if omitted. Furthermore this script takes
care that log-files older than a week are removed once a day.
A file containing following entries should be added to the /etc/cron.d directory to produce records every 20 minutes during working hours
and hourly otherwise:
0 * * * 0-6 root /usr/local/bin/atsa1
20,40 8-17 * * 1-5 root /usr/local/bin/atsa1
See crontab(1) for details.
The shell-script atsaftp counts the new transfers registered in the FTP-logfile(s) since the previous time this script was activated; the
new counters are stored in the /var/log/atsar/ftpstat file in ASCII-format. The names of the FTP-logfiles to be watched are specified in
the /etc/atsar.conf configuration-file.
The shell-script atsahttp counts the new transfers registered in the HTTP-logfile(s) since the previous time this script was activated; the
new counters are stored in the /var/log/atsar/httpstat file in ASCII-format. The names of the HTTP-logfiles to be watched are specified in
the /etc/atsar.conf configuration-file.
Both scripts must be activated just before the program atsadc is started, which also collects these counters.
FILES
/var/log/atsar/atsadd
Daily data file, where dd are digits representing the day of the month.
SEE ALSO
atsar(1), crontab(1)
AUTHOR
Gerlof Langeveld, AT Computing (gerlof@ATComputing.nl)
AT Computing July 2004 ATSADC(1)