Comment all lines in a text file?

I am trying to use tasker to read at random any 1 of 3 lines of text from a text file on my /SD when I ask it "how are you?"

I have the lines set out like this in the text file:

great, how are you ;;;

fine thanks ;;;

not so good ;;;

I have tried using the "File" action and "Read Line", and know I have to put %VOICE ~ *how are you* in the bottom

I have a large text file containing over 180k lines and another text file containing about 1k. I would like to remove lines in the 180k-line file that exist in the 1k-line file. I thought there was a simple way to do this but I haven't come across it yet. Any advice? Thanks :)

In the same spirit as this other question: cat line X to line Y on a huge file:

Is there a way to open from within Emacs (and show on a buffer) a given set of lines (e.g. all lines between line X and Y) from a huge text file?

E.g.

I wish I can grab the first html comment in a file using sed.

Using '/<!--/,/-->/ and having more than one comment block it will match all the content between the first and the last comment block too!

Any advice?

Here a sample:

<!--

First comment block

-->

Content

<!--

Second comment block

-->

The expected output should be:

<!--

First comment block

-->

It

I have a text file which is having 30000 lines in it. I have to create a xml file for each 10000 lines until all the lines in the text files are written. Also please help how can i get number of lines in the text file in a shell variable?

I am using windows and is connecting to an ubuntu server I want to add this line to a text file

/dev/xvdf       /mnt1   auto    defaults,nobootwait     0       0

obviously I prefer to copy and paste that rather than typing it

So I do nano /etc/fstab in amazon ec2

Then what?

I can't paste anything. How do I paste lines like that to nano or any other linux text editor?

Hi All. I have a file that contains some special characters and I'm trying to use AWK to search for lines between <pattern1> and <pattern2>. As an example: I need the lines between the line containing ' select_id="x_0 ' and the line containing the next instance of ' from '.

Is there any way to add lines to the pattern space of sed?

I know a bit about the N flag, but am not able to use it to do what I want which is:

read a file n lines at a time. If I find a match I quit else move to the next line. e.g.

I want to get all lines in a text into one line. I'm a beginner at coding trying to learn by doing. I've spent four hours trying to solve this problem. I know there's a simple solution to this problem. Here's what I've been trying.