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When I tried fmt as shown above, the output is the input. But, the following works, breaking up the lines in test-d at occurrences of "sd" (> is a command prompt):
sed '
> s/sd/\
> /g' test-d >>...

If I try typing sed "s/string/string\n" filename, I'll get "\n" inserted everywhere I want the newline, but they'll be interpreted as a literal "\" and literal "n" by grep, not as newlines, so the...

What's the best way to find a string in a very long file without newlines in Unix? The standard utility I'm aware of for finding a string in a single file is grep, but for a long file without...

I want to replace a text string with a newline. I have a long text file of random characters. I want to replace all the occurences of "pe" with a newline. How can I do that in Unix? There's a...