Hi gan, >Are there some tips(script or command lines) to find useless header files in c or cpp files? Interesting challenge! I recommend using Perl to parse the header files specified in your C++ source file, and maintain a set of the identifiers declared (including #define'd) in that header file. Note: your choice whether or not to dive into header files included by header files (i.e., header files included indirectly). Then make a map of all the identifiers in your C++ source file. Then have Perl "check off" each one of those identifiers in your C++ source file, and note which header file it came from (thus marking that header files as "useful"). When finished, print a list of all the header files that are not marked as "useful". And maybe also print a list of all identifiers that are orphans in your source file. Might be indicative of a missing header file, or a header file that was included indirectly. Voila! HTH, --Eljay
