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Help Needed with Grep

 
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# 1  
Old 10-06-2010
Help Needed with Grep
Hi all,

I need some urgent help with grep.
I'm simply trying to extract the current date from the syslog file, which is "Oct 6" and then grepping this and output the messages to a new log file.
See the below commands and output, even though the log file is created, it is created with all the messages instead of the filtered date "Oct 6", which is cannot extract.
Code:
# todays_date=`tail -1 /var/adm/messages|awk '{print $1, $2}'`
# grep $todays_date /var/adm/messages > syslog.`date +%d%m%y`.log
grep: can't open 6

Thanks and regards,
Wynford
Last edited by Franklin52; 10-06-2010 at 06:35 AM.. Reason: Please use code tags, thank you!
# 2  
Old 10-06-2010
Quote the variable:
Code:
grep "$todays_date" /var/adm/messages > syslog.`date +%d%m%y`.log

# 3  
Old 10-06-2010
Hi Franklin5,
Quote:
Originally Posted by Franklin52
Quote the variable:
Code:
grep "$todays_date" /var/adm/messages > syslog.`date +%d%m%y`.log



---------- Post updated at 10:59 AM ---------- Previous update was at 10:57 AM ----------

Hi Franklin52,

Using your command;

grep "$todays_date" /var/adm/messages > syslog.`date +%d%m%y`.log

the file is created by it's empty.

---------- Post updated at 11:00 AM ---------- Previous update was at 10:59 AM ----------

Sorry, but the file created is a zero byte file, any ideas?
# 4  
Old 10-06-2010
Can you post the output of:
Code:
tail -1 /var/adm/messages

Please use code tags.
# 5  
Old 10-06-2010
Here you go;

Code:
$ tail -1 /var/adm/messages
Oct  6 11:12:06 solsw137-b02b.nls.jlrint.com 1286957: Oct  6 10:12:05: %RTD-1-LINK_FLAP: FastEthernet0/17 link down/up 22 times per min


Moderator's Comments:
Mod Comment Please use code tags!
Last edited by Franklin52; 10-06-2010 at 07:48 AM..
# 6  
Old 10-06-2010
Can you put code tags round the sample. I bet that there are two spaces between
Code:
"Oct  6".

If this is the case you can generate a matching date like this.

Code:
DDMMM="`date '+%b %e'`"            # Month day-with-space

This User Gave Thanks to methyl For This Post:
wthomas
# 7  
Old 10-06-2010
As methyl mentioned, there are 2 spaces between the month and the day, hence my request to use code tags.

Try this:
Code:
todays_date=`tail -1 /var/adm/messages|awk '{print $1 FS FS $2}'`
grep "$todays_date" /var/adm/messages > syslog.`date +%d%m%y`.log

 
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