Solved Help with sed insert from file

[IRJ]

I am trying to insert the contents of a text file into a configuration file using sed

sed -i 's/string_in_file/r /home/user/textfile' -r /dir/conf.file

So I want to replace string_in_file with the contents of /home/user/textfile

Help

[IRJ]

Found the answer here:
https://unix.stackexchange.com/questions/32908/how-to-insert-the-content-of-a-file-into-another-file-before-a-pattern-marker

sed 's/CHANGEME/$x/g' origfile | x="$(<file2insert)" envsubst '$x' > newfile

This will replace every CHANGEME occurence in origfile with the content of file2insert. Remove last g from sed to replace only the first occurrence of CHANGEME.