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Use \r instead of \n . Substituting by \n inserts a null character into the text. To get a newline, use \r . When searching for a newline, you'd still use \n , however.
To delete multiple lines in vi, use something like 5dd to delete 5 lines. If you're not using Vim, I would strongly recommend doing so. You can use visual selection, where you press V to start a visual block, move the cursor to the other end, and press d to delete (or any other editing command, such as y to copy).
If you are on the first line, pressing (upper case) J will join that line and the next line together, removing the newline. You can also combine this with a count, so pressing 3J will combine all 3 lines together.
Certainly. Vim recognizes the \n character as a newline, so you can just search and replace. In command mode type:
:%s/\n/
While on the upper line in normal mode, hit Shift+j.
You can prepend a count too, so 3J on the top line would join all those lines together.
As other answers mentioned, (upper case) J and search + replace for \n can be used generally to strip newline characters and to concatenate lines.
But in order to get rid of the trailing newline character in the last line, you need to do this in Vim:
:set noendofline binary
:w
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