topic Re: Reading from file or variable and extract in between information in Operating System - Linux

Reading from file or variable and extract in between information

amykoh — Thu, 17 Jan 2008 04:04:09 GMT

Hi all,

I need help to in extraction. I have a sed command which filters particular lines I want.

This is then stored into a variable. Or if can be pumped into another file, depending on how best the script is written.

If pumped into a file, below is the output:

Severity............: INFORMATION
Summary:
Adapter at hardware path 0/4/1/0/4/0 : CISS: RAID SA controller is now
online.
Severity............: INFORMATION
Summary:
Adapter at hardware path 0/4/1/0/4/0 : CISS: RAID SA controller is now
online.
Severity............: INFORMATION
Summary:
Adapter at hardware path 0/4/1/0/4/0 : CISS: RAID SA controller is now
online.

If in a variable, it will be in one line.

Basically, what I need to do is read the file/variable and extract and trigger an opcmsg command if it matches "Severity......: Critical" and printing the relevant Summary information with it.

"Severity............: INFORMATION
Summary:
Adapter at hardware path 0/4/1/0/4/0 : CISS: RAID SA controller is now
online."

Hope you can help me.

Thanks.
Amy

Re: Reading from file or variable and extract in between information

Dennis Handly — Sat, 17 Sep 2011 23:39:33 GMT

If you have a file with Severity, Summary and one additional line, then you can do:
TMP=/var/tmp/ae.$$
awk '
/^Severity.*Critical/ {
print $0
getline
print $0
getline
print $0
} ' file > $TMP.2

if [ -s $TMP.2 ]; then
echo opcmsg
cat $TMP.2
fi
rm -f $TMP.2

Re: Reading from file or variable and extract in between information

amykoh — Thu, 17 Jan 2008 08:45:37 GMT

Hi Dennis,

Please forgive my noobness, but what does this line mean?

TMP=/var/tmp/ae.$$

is it a path? or part of the awk statement? does the path depend on the path of my file?

Re: Reading from file or variable and extract in between information

Dennis Handly — Thu, 17 Jan 2008 09:05:50 GMT

>but what does this line mean?
TMP=/var/tmp/ae.$$
>is it a path?

It is a fairly unique temporary file, based on the PID, to keep the extracted info.

Re: Reading from file or variable and extract in between information

amykoh — Thu, 17 Jan 2008 09:25:00 GMT

I see

I ran your script. The cat $TMP.2 output shows 3 entries of
"Severity............: INFORMATION
Summary:
Adapter at hardware path 0/4/1/0/4/0 : CISS: RAID SA controller is now
online."

How can I make it to read each entry as one opcmsg?

Seeing from the cat output, looks like it will trigger one opcmsg with 3 entries.

amy

Re: Reading from file or variable and extract in between information

Dennis Handly — Thu, 17 Jan 2008 11:52:48 GMT

>How can I make it to read each entry as one opcmsg? Seeing from the cat output, looks like it will trigger one opcmsg with 3 entries.

No clue what a "opcmsg" is. What does it take? A string or a file or what?

If you want to jam them together you can do:
$(< $TMP.2 )

Re: Reading from file or variable and extract in between information

amykoh — Fri, 18 Jan 2008 02:06:51 GMT

Hi Dennis,

opcmsg is a command to trigger an event alert in Openview Operations for Windows (OVOW) console. OVOW is a fault and performance monitoring application.

I would like the script to read the file (till EOF), detect EACH occurance of the specified pattern ("Severity............: INFORMATION
Summary:
Adapter at hardware path 0/4/1/0/4/0 : CISS: RAID SA controller is now
online."), and trigger the opcmsg command.

hth explains more..:)

Amy

Re: Reading from file or variable and extract in between information

Dennis Handly — Fri, 18 Jan 2008 02:19:31 GMT

>opcmsg is a command to trigger an event alert

This is useless, you didn't answer:
What does it take? A string or a file or what?

Is it?
opcmsg severity=warning a=a o=o msg_text="test" msg_grp="test"

>EACH occurance of the specified pattern ("Severity............: INFORMATION
Summary:

You originally said, "Critical" and now you said "INFORMATION", which is it?

>trigger the opcmsg command.

So you want to do more than once?

Re: Reading from file or variable and extract in between information

amykoh — Fri, 18 Jan 2008 02:52:53 GMT

Yes, those are the parameters for opcmsg.

opcmsg severity=warning a=a o=o msg_text="test" msg_grp="test"

Occurance pattern would be "Critical".

Yes, if there are a few "Critical" occurances, it should trigger a opcmsg command for each time it finds the pattern.

Re: Reading from file or variable and extract in between information

Dennis Handly — Fri, 18 Jan 2008 03:36:57 GMT

Ok, this script has awk calling the system command to invoke opcmsg. I'm not sure what you want to do with severity=, a=, o= or msg_grp=. I've removed the Severity line and "Summary:".

awk '
/^Severity.*Critical/ {
getline # skip "Summary:"
getline
system("echo opcmsg severity=warning a=a o=o msg_text=\""
$0 "\" msg_grp=\"test\"")
} ' file