Using sed to delete a case insensitive matched line

Question

How do I match a case insensitive regex and delete it at the same time

I read that to get case insensitive matches, use the flag \"i\"

sed -e \"/patt         


        

Answer 1

you can use (g)awk as well.

# print case insensitive
awk 'BEGIN{IGNORECASE=1}/pattern/{print}' file

# replace with case insensitive
awk 'BEGIN{IGNORECASE=1}/pattern/{gsub(/pattern/,"replacement")}1' file

OR just with the shell(bash)

#!/bin/bash
shopt -s nocasematch
while read -r line
do
    case "$line" in
        *pattern* ) echo $line;
    esac
done <"file"