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Full Discussion: printing a line of a file
Top Forums UNIX for Dummies Questions & Answers printing a line of a file Post 564 by Neo on Thursday 14th of December 2000 09:41:32 PM
Old 12-14-2000
Yes, you are right. You run the netstat command and match the output to the IP address you are trying to match in a condition statement. When it matches, you can either pass the matching IP address to another executable script to read the .txt file and do what you want, or read the .txt file from the first script and match.

I would do it all in one script, if not too complex, and execute the script from the crontab file every couple of minutes. You will need a flag and a timer to insure that you do not get multiple hits on an IP address, because the address will linger in netstat longer than the interval between crontab executions.

I would write this in PERL, because PERL is better suited for this that SH, KSH, and these type shells.
 

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LEARN ABOUT OPENDARWIN

sa1

sa1(8)							    BSD System Manager's Manual 						    sa1(8)

NAME

     sa1 -- Generate a system activity daily data file.

SYNOPSIS

     /usr/lib/sa/sa1 [t n]

DESCRIPTION

     The sa1 command is a shell script used to invoke the system activity data collector, sadc.  The binary sample data is collected at intervals
     t seconds apart, in a loop n times.  The binary sample data is written to the standard daily data file, /var/log/sa/sadd where the dd repre-
     sents the current day of the month.

     sa1 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/sadd  Default daily activity file that holds the binary sampling data.  dd are digits that represent the day of the month.

SEE ALSO

     sa2(8), sadc(8), sar(1), iostat(8), vm_stat(1), netstat(1), top(1), sc_usage(1), fs_usage(1), crontab(1), crontab(5)

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