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Thanks to all for the replies.
The solutions given by Franklin and ahmad(second one) is most suited to me, since i need a generic expression, not something that is specific (eg. IP address only).
...

Thanks Franklin52

Can you please explain the logic? I didn't quite understand the use of square brackets.

I want a solution that has no dependency on other columns, because as i said that my input string will have variable columns.

I am using this concept to fetch value of IP address after node= in this line of csv text:

...

I have an xml file.
I am doing some change, say deleting line 770. File name is file.xml. I use:

sed '770d' file.xml

but this does not actually make changes in the *file* but shows the changes...

counter=0
cat size | while read a
do
if [ counter="1" ]
then
cmp2=`echo $a | awk -F " " '{print $5}'`
fi
else
cmp1=`echo $a | awk -F " " '{print $5}'`
elif
counter=`expr{counter+1}`
done
...

Thanks for detailed explanation, bakunin!


No there was a slight problem, I figured out myself why this didn't work:
node=`echo $node | sed 's!/!\\/!g'`
echo $node
a/b/c
I needed to put...

OK a question:



Why this doesnt work:
node=`echo $node | sed 's!/!\\/!g'`
echo $node
output: a/b/c

But this works
echo $node | sed 's!/!\\/!g'
output: a\/b\/c

Thanks
How does this work? Can you please explain.

Input: a/b/c
Output required: a\/b\/c

This does not work:
sed s/'\/'/'\//'/g

I have this simple awk statement:

awk -F "," '/'"$node"'/ {print$0}' temp1.csv > temp.csv

Now consider the following cases:
case1:
$node=ABC-ind.aus.in.chi.gcp.net
and
temp1.csv:...

I have a shell script similar to:

#!/bin/sh
a=1
source a1.sh -- Modifies a
source a2.sh -- Modifies a
echo "After execution, value of a is $a"

What i need is a1.sh script modify the same...

First tell us what you have tried.

So that we can suggest you improvement..

Its not fetching the correct value.
defnfile is a shell variable, not awk variable...

meas is a shell variable, and this works perfectly fine for me:

awk -v var=$meas -F, '$1==var' /abcd/efgh.txt > temp1.csv

However, i want to introduce another shell variable, named, defnfile in...

I suppose you meant this

awk -F "," '$1 == "$meas"' defn.csv > temp.csv

No, its not fetching anything... :(

I have this following statement:

awk -F "," '/'"$meas"'/ {print$0}' defn.csv > temp.csv

$meas variable has been taken care of to fetch a variable from user.

My defn.csv file containes these...

Thanks. It worked. Could you explain me where i went wrong?

I have a variable, defndata, which is a number (fetched from a file using awk).

I want that if defndata is not initialized (that is its not found in the file using awk), then to execute a block of...

yes it works!

And thanks for the tip.

I am using ksh.

Do you mean to use this:

if [[ ($dumpdata -eq $defndata) || (($dumpdata -le $compare1) && ($dumpdata -ge $compare2)) ]]

I have four variables, dumpdata, defndata, compare1 and compare2

I want an IF statement condition which returns true when either dumpdata=defndata or (dumpdata<=compare1 and dumpdata>=compare2). ...

Stupendous!
Works like a charm, Thanks!

If you dont mind, can you just explain a little bit of that sed command you used, agn?

I have a beginner level of understanding. What i read in a book...

I have some input file, which contains some lines which are comma separated. Eg.

a,b,id=999],d
d,f,g,id=345],x
x,y,x,s,id=677],y

I run a loop to read the lines one by one. What i want is to...