How can I remove a line-feed/newline BEFORE a pattern using sed

Question

The title already states it:

I want to use some linux one liner (e.g. sed)

to transform

Anytext
{

into

Anyt         


        

Answer 1

One way using sed:

sed -ne '$! N; /^.*\n{/ { s/\n//; p; b }; $ { p; q }; P; D' infile

A test. Assuming infile with content:

one
Anytext
{
two
three
{
four
five
{

Output will be:

one
Anytext{
two
three{
four
five{