Question

I would like to know which files do not include a particular header file in C.

For example:

file1.c

#include "stdio.h"
#include "my.h"

…

file2.c

#include "stdio.h"

….

I would like to find out similar files (like file2.c) which do not contain #include "my.h".

Answer 1

shopt -s nullglob
for file in *.c
do
   if grep -q "my.h" "$file" ;then
     continue
   else
      echo "found file that don't have my.h"
   fi
done

Or you could use:

grep -L "my.h" *.c

if you have nothing else to process except to echo out file names. 🙂