Multiline processing in sed

You want sed to replace backslash-newline to space (i.e. to convert multiline string into a singleline) like this:


param =
     val1, \
     val2, \
     val3


should become


param = val1, val2, val3


The following sed command does the trick

sed -e :a -e '/\\$/N; s/\\\n/ /; ta'

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