Question : How to use dynamic variables in sed

how do i use dynamic variables in sed;
eg:
a=1
sed -ne '1p'
What if i wanted to use $a in the sed expression.
I dont know the syntax of it.

Answer : How to use dynamic variables in sed

I think you are using sh or bash.

sed -be 1p does exactly the same such as head -n 1
which is print the first line.

If you want to pas the number as variable, this:


a=1
sed -ne "$a"p filepath

would work. I tested.