Issue
How to get content of file which name is obtained by regex, to be inserted by way of replacing that line, within the sed's applied file? e.g. illustration
$ sed -E '/^file:\s*(\S+)/ r"\1"' file.txt
try to have content of file as visible string found following file: to replace the line where regex matches inside the file.txt
Solution
This might work for you (GNU sed):
sed -E '/^file:\s*(\S+).*/{p;s//cat "\1"/e}' file
Print the line matching the regexp and then evaluate the command cat on the first back-reference.
If the matching line is not needed, then a substitution is suffice:
sed -E 's/^file:\s*(\S+).*/cat "\1"/e' file
Answered By - potong Answer Checked By - Dawn Plyler (WPSolving Volunteer)