imagining that you have a file with these urls :

http://someurl.com/......
http://
http://anotherurl.com

How to delete that 2nd line only with sed , by making sed search for it and delete it .

Don't need to use sed for it.

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not working .

using :
will delete all http:// in file , and i just want those alones .

Works fine for me:

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@pedropt:Indeed, that doesn't work. How about adding ^ and $ ?

is not working because i am using 8 sed commands in a line variable to clear a very complicated xml file with a lot of stuff to remove .

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Interesting that if i use that code on a multiple commands line it not works

like : sed something <filename | sed otherstuff | sed morestuff | grep -v ^http://$ >newfilename

or even :

var1=$(sed something <filename | sed otherstuff | sed morestuff | grep -v ^http://$ )
echo $var1 > filename2

but if i use it alone it works .

Why is this happening ? Does anyone knows ?

Kindly read this: https://stackoverflow.com/help/mcve

eventually i fixed the issue , but i got a new issue , now with tr command to split the lines i text , but i will create a new thread .

The way i solve this issue was from first line of commands create an output , and then after that i used that output with the grep command you provided to create a new clean file without the http:// .

thanks .