UNIX for Advanced & Expert Users

/tmp/dave/myappend.txt
/tmp/dave/dir1/test.txt
/tmp/dave/dir2/test.txt
/tmp/dave/dir3/test.txt
/tmp/dave/dir4/test.txt

find /tmp/dave/* -type d -exec sed -e "\$a/r /tmp/dave/myappend.txt" -e "//d" test.txt {}/ \;

sed: -e expression #2, char 0: no previous regular expression
sed: -e expression #2, char 0: no previous regular expression
sed: -e expression #2, char 0: no previous regular expression
sed: -e expression #2, char 0: no previous regular expression

cd /tmp/dave
for i in */test.txt
do      cat append.txt >> $i
done

find /tmp/dave/* -type f -name test.txt -type d -exec sed '$r /tmp/dave/myappend.txt' {} \;