https://manpages.ubuntu.com/manpages/stonking/man1/grepc.1.html
Ubuntu Manpage: grepc - find declarations, definitions, and uses in source code
find declarations, definitions, and uses in source code
ubuntumanpagefinddeclarations
https://manpages.ubuntu.com/manpages/stonking/man1/grepc_c.1.html
Ubuntu Manpage: grepc_c - print PCRE patterns for searching C code
print PCRE patterns for searching C code
ubuntumanpagecprintpatterns