Question

I use the following sed syntax in order to replace the timezone string with #timezone

actually sed command replace it ,
but in case after timezone string we have one space or more then sed not replaced it

my question what I need to change in the sed syntax in order to replace the timezone string
on the both cases

1. After timezone string we not have any space

2. After timezone string we a have space or more

   sed -i '/timezone$/s/timezone/#timezone/' file
   

Answer 1

You can try:

sed -i.bak -r 's/timezone ?$/#timezone/' file

you need to add the ? after a space, that will make the space optional. Also you’ll have to add the -r option to make sed understand extended regex.

Also you are not specifying the backup extension after the -i option.