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

This might work for you (GNU sed):

sed ':a;$!{N;/.*\n{/ba};s/\n{/{/g;P;D' file