15 amazing example of deleting lines from file using sed | Unix command

In this video we will discuss how to delete lines from a file using sed command.We will see 15 unique example.
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[@archanapaniraj1498]

Excellent ..very useful

[@anupravgupta2747]

Excellent..!!

[@RajeshKumar-qw8wf]

Amazing video

[@vikasmahour6059]

Thanks for your vedios.
I am stuck in a problem .
My XMl FIle contains data like :

1234


2345


8787987


89898


80098

I want to arrange my xml file such that the tags and should be in a single line without space.

1234


2345

8787987

89898

80098
Tried many sed commands but no luck.Please help me to resolve it .

[@rohanofelvenpower5566]

Damn thats hard. I think your sed command needs to achieve at least 2-3 different tasks so multiple sed commands piped inti each other or cincataned with -e argument or maybe many other helper arguments used instead.
I dont know how to do it just saying its very complex at first sight.
Have you figured it out? Please paste the answer if youve found it. 😊

[@josyrudahuga2628]

How do you delete a duplicate lines ?

[@manasayejandla6634]

Can you plz let us know how to delete the content permanently with sed command ? In video, it's not clearly audiable

[@tec-skill]

Use sed -i

[@rohanofelvenpower5566]

Thanks but not explaining logic behind. Rather its like youre quickly doing your homework for school :)
So '$d' deletes the last line in the file. But is it in expanded form as '$//d' or '/$/d' ? 😅
Or the last example in the video. '${/line/d;}' how does this work? Are square brackets a common regex concept? Why the ; after the d ?