Replace everything between two character

Question

All.

I am newbie to sed.

I want something like

Input:

ABC,DEF,GHI,JKL,MNO

Output:

ABC,,,,MNO

Means....

I want to remove all contents between two ','

Answer 1

you could set all fields between 1 and last to empty with awk:

awk -F, -v OFS="," '{for(i=2;i<NF;i++)$i=""}7'

Answer 2

This might work for you (GNU sed):

sed 's/[^,]*,/,/2g' file