sed replace newline

sed 's/\n/ /g'
sed 's/$^/ /g'

doesn't work

You have to use

sed ':a;N;$!ba;s/\n/ /g'

1. create a label via :a
2. append the current and next line to the pattern space via N
3. if we are before the last line, branch to the created label $!ba ($! means not to do it on the last line (as there should be one final newline)).
4. finally the substitution replaces every newline with a space on the pattern space (which is the whole file).

Link:

• http://stackoverflow.com/questions/1251999/sed-how-can-i-replace-a-newline-n