Shell Programming and Scripting

I have a workaround to the problem i m posting, however if someone wants to look at my query and respond ... i will appreciate.

This is in reference to this thread -> Extract between two Exact matched strings.

I have data.txt as below.
I have a variable as below.

Code:

lines=/u

I wish to EXACT match and extract data From Start_of_DISK_info:$lines to End_of_DISK_info:$lines as shown below.

I tried this as a solution

Code:

sed -n "\|Start_of_DISK_info:$lines$|,\|End_of_DISK_info:$lines$|p" data.txt

But, it is matching both /u and /u/tmp thus extracting the whole data.txt.

So, it is not doing an exact match which is what i was looking for.

Can you tweak this command to get the desired results?

sed is often a difficult choice for anything stretching across multiple lines. awk has a special setting, RS="", to read entire blocks of text separated by blank lines at once.

Code:

$ awk 'index($0, "Start_of_DISK_info:"S"\n")==1' RS="" ORS="\n\n" S="/u" data

Start_of_DISK_info:/u
Disk: /u
CURRENT=81
End_of_DISK_info:/u

$

You'd have S="$lines"

First, you need to define what "exact match" means for you: actually it matched the exact phrase you were searching for - the line contained just something else besides of what you matched. What you are looking for is not a "exact match" but an "exact match with nothing else to follow", yes?

Yes, i can and so can you. Reading the above should make it obvious: anchor the regexp to the end of line.

I hope that helps.

bakunin

Believe me it does not return any output. I am on

Code:

uname -a
SunOS mymac 5.11 11.2 sun4v sparc sun4v

Show your actual input, please. Attach it if necessary.

Also, try nawk.

You can use sed to process more than one line with the command N to append the next line to the "pattern" space (usual area that can be searched or modified) and the 2nd line will be separated from the 1st by a newline "\n". If you use this you might need to put your sed commands in a separate file rather than the command line.