[ale] I need a bash clue.

[Joe Knapka]

I could solve this with a trivial Python program, but I'd rather
understand how to make bash do it on the command line, if it can be
done.

The task is: starting at the current directory, visit every directory
in the subtree and run "etags" on every .c|.cc|.cpp|.h|.hpp file in
each directory, leaving the resulting TAGS file in the directory
containing the source files. I've tried the obvious

 find . -type d -exec ( pushd {} ; etags *.c ; popd ) ;

but that fails due to syntax errors on the parens. Escaping the parens
leads to different syntax errors.

I *can* do 

 etags `find . ( -name "*.c" -o -name "*.cc" -o -name "*.cpp" ) -print`

But then the TAGS file gets created at the root of the tree I'm
looking at, which isn't what I want. The structure of what I want to
do is simple: visit each directory, make it current, and run a command
(which may need to use shell characters). But how to actually feed
that command to "find" is not obvious to me.

Yeah, I could read the bash man page for the Nth time, but I'm hoping
someone here can answer the question more quickly from personal
knowledge :-)

Thanks,

-- Joe

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