Bash sed如何遮罩括号

Question

I want to search for 'start') in the file /etc/init.d/fhem , and write code which I read from a textfile to that file after the statement above. At the moment I get a message that I have to close the bracket from 'start') . I think I have to mask it properly, but so far no luck with trying that. May someone give me the missing link?

CocConf=$(<COC.txt)#Reading Cod from File to insert in other file
sed -r "\'start\')/a $CocConf" /etc/init.d/fhem #Inserting said Code

Answer 1

You're missing the / before the regular expression. And there's no need to escape single quotes inside double quotes. But when you use extended regexps, you need to escape parentheses. The a command also requires a backslash after it, and the text to be added must be on the next line.

sed -r "/start\)/a\
$CocConf" /etc/init.d/fhem