*nix Guru's Unite - Shell Script advice/help

[sd-slider 0]

I am trying to clean up multiple syslog digests to make reporting a breeze for my Mgmnt(arrgh!)

I basically have a date stamped syslog entry of:

Jan 18 13:18:07 10.3.1.99 Elbie, Interface ethernet2, state up

The system name varies so there will be multiple if/then/while statements to filter the grep’d output to the appropriate files/variables.

My dilemma……I would like to look @ each days date from the date command as follows and force the numeric value on the previous day into a variable and print that variable elsewhere in the script. The problem is n-1 is zero on the first of every month…… Date output:

Thu Jan 18 14:43:44 PST 2006

My current script is forcing the current date into $PREVDAY at the end of the script and grep’n the desired values for the current days report (confused?).

Anyhoo, the script is as follows:

[root@otter scripts]# vi maildev
#!/bin/bash

### Get some info
cat /var/log/messages | grep Elbie > /home/scripts/lbsum.txt

### SET THE VARIABLES
day=`echo $PREVDAY | awk '{print $3}'`
month=`echo $PREVDAY | awk '{print $2}'`
year=`echo $PREVDAY | awk '{print $6}'`
test=`cat /home/scripts/lbsum.txt | grep "$month $day"`

### Set the environment for the next days reporting cycle
PREVDAY=`date`

### SEND THE COMPLETED MAIL
Mail -s "Dev Awk Script Output for $month $day $year" user@dot.com <$test
EOF

Any suggestions or shortcuts would be appreciated. I was hoping to have a more “portable” solution that didn’t require volatile variables or static files for storing info.

Thanks,
=Slider

Anvil Brother #69

Sidelined with a 5mm C5-C6 herniated disk...
Back2Back slammers and 40yr old fat guys don't mix!

[AlexCrowley 0]

Why not just get the previous day using date

date --date="yesterday"

TV's got them images, TV's got them all, nothing's shocking.

[sd-slider 0]

Mr. Crowley,

Thanks a *illion.

I took the simpler, logical approach(so I thought) and wound up with a headache.

Thanks again,

=Slider

Anvil Brother #69

Sidelined with a 5mm C5-C6 herniated disk...
Back2Back slammers and 40yr old fat guys don't mix!

[AlexCrowley 0]

I thougth my method was simpler than how you're setting it up.

Like this:



day=`date +%a --date="yesterday"`
month=`date +%b --date="yesterday"`

Or you could pull in the full date string as above and use awk for the fields, really depends on your concept of simple I guess
Hope that helped!

TV's got them images, TV's got them all, nothing's shocking.

[sd-slider 0]

Works much better!

Thx

Anvil Brother #69

Sidelined with a 5mm C5-C6 herniated disk...
Back2Back slammers and 40yr old fat guys don't mix!

[nathaniel 0]

If you already know awk, the systime() and strftime() functions of gawk--not regular awk-- also come in handy.

eg
gawk 'BEGIN {print strftime ("%c", systime() - 86400)}'

or in perl,
perl -e 'use POSIX;print strftime("%c", localtime(time - 86400));'

86400 being the number of seconds in 1 day.

My advice is to do what your parents did; get a job, sir. The bums will always lose. Do you hear me, Lebowski?