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Thanks Dear Don Cragon!

It was really helpful. I tried below and it is working.

sed -i -e "s@prob=@prob=$1;//@g" file.txt

I will also try the rest of ways that you explained. Thanks again.

This is not an homework assignment. I am implementing a routing protocol for which i need to run the simulation many times with changed values (Changing the value of variable $var1).

So, would you...

I have attached the sample shell and sample text file. These are doing the same as i mentioned in my post without any error.

I am using a shell script in fedora linux. While calling to the shell I am also passing an argument (var1=0.77) like shown below

sh gossip.sh var1=0.77

in the shell following command is written...