Shell Programming and Scripting

And, by the way, it wouldn't have worked when entered interactively ("on command line"), either.

Many Thanks Ravinder for the solution
And Thanks Rudic For the explanation.

Ravinder,
The single quote one worked.

Code:

/usr/bin/sed 's/'${a}'/'${b}'/g' /user/iomaint/tempo/gtm/sed/filetosedreplace

and the double quote one is not working as one can expect/ assume.

Thanks
Goutam

---------- Post updated at 08:50 AM ---------- Previous update was at 08:45 AM ----------

Hi RudiC,

I think I am not that good at explaining things/ issues.
Yes in command line , i was just using values in sed command and not using variables.

Will try to be more precise while narrating issues henceforth.
Anyways thanks again for the help. Happy that issue got resolved and most importantly i realized the fault.

How about

Code:

sed "s/$a/$b/g" /user/iomaint/tempo/gtm/sed/filetosedreplace

given neither $a nor $b contain characters with special meaning when used inside regexes.

In more complex expressions, where everything in quotes is too cumbersome, the shell variable references should be in quotes nevertheless (where the quotes must appear in the shell context, so the shell substitutes them and they do not appear in the sed context)

Code:

sed 's/'"${a}"'/'"${b}"'/g' /user/iomaint/tempo/gtm/sed/filetosedreplace

Yes This too works.
Thanks RudiC. Brilliant !!