Use sed to replace string with whois command output

Question

I have a text file, containing the string ${whois} .

I wish to replace ${whois} with a whois command output of an IP address or domain. The result of a whois is pretty long and it generally goes wrong with everything I've tried to far.

I get errors such as unterminated 's' command or invalid regular expressions , and so on.

Can anyone provide me a working command that replaces the keyword ${whois} with a whois output of a domain or IP address?

Answer 1

Try

$ whois > whois_out.txt
$ sed -e '/${whois}/r whois_out.txt' -e '//d' input_file.txt

• First save the output of command in a file
• Then use r command for robust replacement and delete the matching line