shell - How to read output of sed into a variable

Question

I have variable which has value "abcd.txt".

I want to store everything before the ".txt" in a second variable, replacing the ".txt" with ".log"

I have no problem echoing the desired value:

a="abcd.txt"

echo $a | sed 's/.txt/.log/'

But how do I get the value "abcd.log" into the second variable?

Answer 1

You can use command substitution as:

new_filename=$(echo "$a" | sed 's/.txt/.log/')

or the less recommended backtick way:

new_filename=`echo "$a" | sed 's/.txt/.log/'`