Question

I have several source code files in a multi-level directory which contain forward declaration to a function

extern "C" void myPrintf(char *fmt, ...);

I want to remove this declaration from all the files.
I could do a grep which prints the line containing that declaration for all the files but not sure how to pipe it with sed to get the desired result.

Answer 1

With GNU sed

sed -i '/extern "C" void myPrintf(char \*fmt, \.\.\.);/d' *.c

If you want to perform this recursively, you have two options:

With Bash 4.X

shopt -s globstar; sed -i '/extern "C" void myPrintf(char \*fmt, \.\.\.);/d' **.c

With find

find /some/path -type f -name "*.c" -exec sed -i '/extern "C" void myPrintf(char \*fmt, \.\.\.);/d' {} \;