Replace no work

[bsdlover]

#!/bin/sh
echo Enter directory to replace example [/etc/hosts/]:
read dir
echo Enter original text:
read orginal
echo Enter replaced text:
read replace

if [ "$orginal" = "$replace" ]; then
clear
echo Error
else
  find ${dir} -type f -exec sed -i 's/${orginal}/${replace}/g' {} \;
fi

Where is the problem ?

[lomcevak]

Replace the single quotes with double quotes:

"s/${orginal}/${replace}/g"

[Irithori]

Two points:
1) You do realise, that this script is dangerous?
If ${dir} would be empty or "/" for whatever reason, then you have a good chance of corrupting files.

2) It doesnt add value.
2a) If it is intended for a non-technical user, then it lacks input validation and sanitation.
A lot input validation/sanitation

2b) For a technical user it is useless, as it adds no logic. (S)he would be better off calling find/sed directly