Remove new lines from a text file

I want to copy some text from a PDF file into a word processor. Copying works, but the line breaks from the PDF formatting are also copied. This messes up the text and results in disconnected text with many rows. I decided to use the command line to fix this automatically. I searched a bit and it seems that there are two steps that have to be taken.
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Break a line in Inkscape

I have a solid line in Inkscape and I want to insert a line break, say, in the middle. The reason is that I had a relatively complex figure generated as SVG, where I need to colour some lines in half.

So, here’s how to do it: Read the rest of this entry »