I have 2 directories with 1000s of files and subdirectories.

there are no doubt some duplicate named files.

I would like to merge the 2 directory structures without clobbering
files with duplicate names.

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i found some answers finally with google

cp -Riv --reply=no test1/* test0/

i can then clean up the source folder with a dup file finder

the rest of the possible answers are below:
===========================
find dir1 -type f | PERL -lne 'm#([^/]*)/(.*)$#;print "mv -i $1/$2
dir2/$2";'|sh

#!/bin/ksh
for i in `find dir1 -type f`
do
new_folder=` echo $i | sed -e 's/dir1/dir2/' `
echo mv $i $new_folder  | sh
done

cd dir1; tar cf - * | (cd ../dir2; tar xvf -)

cp -Rf dir1/* dir2/
rm -f dir1/*

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