file manipulation

[minus0]

Is there a way of deleting some lines from a file without actually opening it? I have some logs that I need to go over for analysis but I need to look at the entries only after a particular time say 11:30pm so I wish to delete all the entries from the log that are prior to 11:30pm. Its not just one file that I need to look at so manually deleting the entries is not really an option.

Appreciate any inputs

 

[sushveer]

Hi minus0
can you give the file contents so that I can give the exact command syntax ...I have couple of doubts like:
11.30pm line number is constant or changing every time...
And I want to see the location of that word in your file..
I will give sed command syntax that will serve your purpose.
please reply ASAP

sushveer
IBM certified specialist-p-series AIX5L System Administration
AIX/SOLARIS/WEBSPHERE-MQ/TIVOLI Administrator

 

[sushveer]

Hi minus0

If you have strictly the 11:30pm line in your file ...you can delete the all entries in your log file prior to 11:30pm
as follows.If you provide me with your log file as I requested in my previous post ...it will be more understandable...anyway ...try this...

#sed -n '/11.30pm/,$p <inFile>outFile

Now cat outFile ...


sushveer
IBM certified specialist-p-series AIX5L System Administration
AIX/SOLARIS/WEBSPHERE-MQ/TIVOLI Administrator

 

[sushveer]

Hi minus

There is a typo(single closing quote missing) in my previous post...
please read as
sed -n '/11.30pm/,$p' <inFile>outFile



sushveer
IBM certified specialist-p-series AIX5L System Administration
AIX/SOLARIS/WEBSPHERE-MQ/TIVOLI Administrator

 

[minus0]

Hello Sushveer,

I wouldn't know the line number and the reason I mentioned 11:30pm - the Applications I work on are restarted every night at 11:30pm. I would see something like

Timestamp: Application started

I will try out your sed command tomorrow and let you know the result - thanks for your help

 

[minus0]

Sushveer,

Your tip helped me a lot - thanks

 

[bsalter]

minus0,

Why don't you set up a cron job to rotate the logs around 11:30pm when the apps restarted. Here's a script we use for some log files that are constant (it originally came from Netscape log rotate);

DATE=`date +%y%m%d`
LOGDIR=/usr/local/logs
LOGS='app1.log app2.log app3.log app4.log'

(cd ${LOGDIR}
for file in ${LOGS}
do
if [ -f &quot;$file&quot; ]
then
mv $file $file.${DATE}
fi
done
)

# Clean up older log files
find ${LOGDIR}/app1.log.* -mtime +14 -exec rm {} \;
find ${LOGDIR}/app2.log.* -mtime +7 -exec rm {} \;
find ${LOGDIR}/app3.log.* -mtime +3 -exec rm {} \;
find ${LOGDIR}/app4.log.* -mtime +14 -exec rm {} \;

And here's the cron entry;

31 11 * * * . /usr/local/sysadm/bin/log_roll.sh > /dev/null 2>&1

Good luck

 

[minus0]

Thanks for the suggestion about setting up a cron job - I do have a cron job set up and it works too ;-) but I needed to analyze some of the old logs - thanks again