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How to replace a pattern in one file with the contents of another file using sed?

Suppose I have fileA

, with the content

Hello, this is some
random text REPLACEHERE and some more
random text

and fileB

with content

stuff that goes into
fileA, at that specific place

How to properly replace REPLACEHERE

inside fileA

, with content fileB

? Exactly at this point, as if I were doing a simple regex operation?

The closest I got

sed -i '/REPLACEHERE/r fileB' fileA

which ends up adding fileB to the line after it REPLACEHERE

was found and that's not good. I need it to be replaced exactly in place (I thought there was actually a flag i

).

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1 answer


Most likely it won't be that easy with sed

, I would use a shell / command extension:

sed -i "s/REPLACEHERE/$(cat fileB)/g" fileA


-i

means that changes will be saved to fileA

, not printed to stdout

.

Note the forward slashes in the fileB

. If they are, they must be screened.

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