Using sed to delete a case insensitive matched line

问题

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 "/pattern/replace/i" filepath

and to delete use d

sed -e "/pattern/d" filepath

I've also read that I could combine multiple flags like 2iw

I'd like to know if sed could combine both i and d I've tried the following but it didn't work

sed -e "/pattern/replace/id" filepath > newfilepath

回答1:

For case-insensitive use /I instead of /i.

sed -e "/pattern/Id" filepath

回答2:

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"

来源：https://stackoverflow.com/questions/2157288/using-sed-to-delete-a-case-insensitive-matched-line