text - How to replace a pattern with newline (\n) with sed under UNIX / Linux operating systems? -

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i have txt file contains:

some random text here. file has multiple lines. should 1 line.

i use:

sed '{:q;n;s/\n/:sl:/g;t q}' file1.txt > singleline.txt

and get:

some random:sl:text here. file:sl:has multiple lines. should 1 line.

now want replace :sl: pattern newline (\n) character. when use:

sed 's/:sl:/&\n/g' singleline.txt

i get:

some random:sl: text here. file:sl: has multiple lines. should 1 line.

how replace pattern newline character instead of adding newline character after pattern?

sed uses & shortcut matched pattern. replacing :s1: :s1:\n.

change sed command this:

sed 's/:sl:/\n/g' singleline.txt

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