goinsert

goinsert is tool for insert text to file
known another solution as used sed command, but
can't get i expected result in mac

you can use to echo command if you want insert to last line

example

hoge.txt

text

command

goinsert -file=hoge.txt -text=aaa

hoge.txt

aaa
text

find . -iname *.hoge | xargs goinsert -text=aaa