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lang-bash
|) the message (echo '...') tocatwhich uses-(standard input) as the first file andtodo.txtas the second.catconCATenates multiple files. Send the output (>) to a file namedtemp. If there are no errors (&&) fromcatthen rename (mv) thetempfile back to the original file (todo.txt).catreceives a literal backslash n, it won't convert it to a newline. Something else must have done that. Instead ofcat, try piping intohexdump -Cto see if you're actually sending backslash and n or if it's a newline. You could also trycat -eto show line endings.1means do the next command only on line one of the file and theicommand is insert. Look in the man page under the "Addresses" section and in the "Zero- or One- address commands" section.