Extracting strings from grep result

Question

I am running this command to extract some data from our log file. I am getting full line but what I am interested in the value associated with Message ID.

command I am Running -

grep -B 2 UPDATE_CHAIR_DESK_REQ Application.log | head -1000

Output I am getting

< MessageId :ID:414d51204541495052475731202020205143d55bf3f13821>
 < AppServiceID :abcfcdd>
 < ReplyToQName :UPDATE_CHAIR_DESK_REQ>
--
< MessageId :ID:414d51204541495052475731202020205143d55bf7f13821>
 < AppServiceID :abcfcdd>
 < ReplyToQName :UPDATE_CHAIR_DESK_REQ>
--
< MessageId :ID:414d51204541495052475731202020205143d55bf7f13821>
 < AppServiceID :abcfcdd>
 < ReplyToQName :UPDATE_CHAIR_DESK_REQ>
--
< MessageId :ID:414d51204541495052475731202020205143d55bfbf13821>
 < AppServiceID :abcfcdd>
 < ReplyToQName :UPDATE_CHAIR_DESK_REQ>
--
< MessageId :ID:414d51204541495052475731202020205143d55bfbf13821>
 < AppServiceID :abcfcdd>
 < ReplyToQName :UPDATE_CHAIR_DESK_REQ>
--
< MessageId :ID:414d51204541495052475731202020205143d55bfff13821>
 < AppServiceID :abcfcdd>
 < ReplyToQName :UPDATE_CHAIR_DESK_REQ>**

What I am looking for is the values in front of MessageId :ID: , it is always of 48 characters in length. I want to enhance my grep command to get only these values in a column format either on screen or on file.

score 1 · Answer 1 · answered Nov 13 '18 at 17:13

1

grep -B 2 UPDATE_CHAIR_DESK_REQ Application.log | egrep -o ':ID:.{48}'

answered Nov 13 '18 at 17:13

Nick Ellis

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2

To get *just* the id, you could use `grep -oP 'MessageId :ID:\K.{48}'` – glenn jackman Nov 13 '18 at 17:17
or add `| cut -d: -f3` – Nick Ellis Nov 13 '18 at 17:19

score 0 · Accepted Answer · answered Nov 13 '18 at 17:16

0

With awk, you could use:

awk -F'[:>]' '
    $1 ~ /MessageId/ {msgId = $3}
    $2 == "UPDATE_CHAIR_DESK_REQ" {print msgId}
' Application.log

answered Nov 13 '18 at 17:16

glenn jackman

238,783
38
220
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Thank You Glenn, it has worked exactly per my requirement. – Vikas B Nov 13 '18 at 17:22

Extracting strings from grep result

2 Answers2