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Scripts to output contents every 3 hours

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# 1  
Old 08-01-2006
Scripts to output contents every 3 hours
Hi all,
I would like to capture the file contents every 3 hours. I will put the schedule inside crontab, how to get only incremental contents from the last 3 hours?
Thanks.
# 2  
Old 08-01-2006
One way is to actually truncate the file after you take the output. That way, you don't have to worry about the older contents at all. Or you could write a script to check the number of lines in the file when you actually take the output and then keep taking the output from that point on.
# 3  
Old 08-01-2006
Below shows my script:
Code:
C_DATE=`date +"%a %b %e "`
C_HOUR=`date +"%H"`
C_TIME=`date +"%p"`
ORACLE_HOME='/u01/oradw';export ORACLE_HOME
ORACLE_SID=PDWH;export ORACLE_SID

sed -n "/^$C_DATE/,$ p" $ORACLE_HOME/admin/pdwh/bdump/alert_$ORACLE_SID.log > temp$$
#
sed -n '/^ORA-/ p' temp$$ > ora_errors

Every 3 hours, the script will check and grab the content to an output file. What I get is everything on a specific date. I would wan to have an incremental output that generate only during that 3 hours. Thanks
Last edited by blowtorch; 08-01-2006 at 10:59 PM.. Reason: to put in code tags
# 4  
Old 08-01-2006
Try something like this:
Code:
#!/usr/bin/ksh

C_DATE=`date +"%a %b %e "`
C_HOUR=`date +"%H"`
C_TIME=`date +"%p"`

read line 0<test.line

sed -n -e"$line,$ p" test >> test$$
wc -l test|tr -d '[:space:][:alpha:]' > test.line

Here, you always read ahead from the last line in the file. So you do not have to look for the date either. You can initialize this to start from the first line in the file by entering "1" in the test.line file or start from the current state by entering the current 'number of lines' in the test.line file.

Please test this before putting in a production env.
# 5  
Old 08-02-2006
Hi, Thx a lot for the script. We will rename that file to another name once a week, which means the original file will start with 0 bytes 0 lines again.

So it's not accurate to count with lines.
How to print contents that consist of 2 strings, eg: ora & date?
Bcoz my script is to print out contents consists of ora- only.
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