TwentyFourSeven
asked on
AWK/GREP combination question
Hello,
Assuming I've got an output similar to the following to parse :
My questions are as folllows :
(1) I would like to display only rows where column 3 status has changed. "grep -v" is too coarse, it looks at entire rows, and "awk {print $3} | grep -v" doesn't do the job of outputting whole rows. Unfortunatley my shell coding expertise is limited to know of other options !
(2) What is an efficient way of continuing the script if there is output from the above ?
The above does not seem very efficient, because I would need to call the piped command again in order to be able to use its output.
Assuming I've got an output similar to the following to parse :
One 12345 Connected
Two 67890 ConnectedMy questions are as folllows :
(1) I would like to display only rows where column 3 status has changed. "grep -v" is too coarse, it looks at entire rows, and "awk {print $3} | grep -v" doesn't do the job of outputting whole rows. Unfortunatley my shell coding expertise is limited to know of other options !
(2) What is an efficient way of continuing the script if there is output from the above ?
count = ` some piped commands | wc -l `
if [$count -gt 0]
then
do something
fiThe above does not seem very efficient, because I would need to call the piped command again in order to be able to use its output.
ASKER
woolmilkporc,
Thanks for your quick reply, sorry I was not very clear.
Basically in the long run, I want to generate an alert email showing which lines are not "Connected".
If everything is "Connected", no email should be sent.
Hope this clarifies.
Thanks for your quick reply, sorry I was not very clear.
Basically in the long run, I want to generate an alert email showing which lines are not "Connected".
If everything is "Connected", no email should be sent.
Hope this clarifies.
ASKER CERTIFIED SOLUTION
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ASKER
Thank you !
Thank you for the points, but I think the script will not do exactly what you're expecting, because it will send out one mail per matching line, which is a bit silly!
Let's do it this way
MATCH=$(command | awk '$3!~"Connected" {print}')
[[ ! -z "$MATCH" ]] && echo "$MATCH" | mailx -s 'Lines other than "Connected" found!' recipient@domain.tld
One run, one mail, regardles of the number of lines!
wmp
Let's do it this way
MATCH=$(command | awk '$3!~"Connected" {print}')
[[ ! -z "$MATCH" ]] && echo "$MATCH" | mailx -s 'Lines other than "Connected" found!' recipient@domain.tld
One run, one mail, regardles of the number of lines!
wmp
ASKER
Well spotted..... I can see how your original might have been a bit noisy !
I'm not quite sure what you're trying to accomplish.
Just checking the third column for not containing "Connected" and outputting those lines is quite simple -
command | awk '$3!~"Connected" {print}'
This will examine every line command produces.
To process the displayed data you could do
command | awk '$3!~"Connected" {print}' | while read line
do
## do something with $line, maybe split into variables $1, $2, $3
set $line
echo "1st word is " $1
echo "2nd word is " $2
echo "3rdword is " $2
done
What else would you like to do?
wmp