How to run shell scripts starting with ./ on Ubuntu and Mac without any modification?

Question

Orignal code, meant for Ubuntu:

./rebar get-deps
./rebar compile

When I try:

sh start.sh
start.sh: line 5: ./rebar: No such file or directory

The fix is simple, just remove ./

But how to make the script running both on Ubuntu and Mac without forcing user to make any changes?

---

EDIT / UPDATE: rebar is Erlang tool installed via brew install rebar

Here is the original start.sh file: https://github.com/aeternity/testnet/blob/master/start.sh

I think it's difference between Mac and Ubuntu - the script supposedly works on Ubuntu (didn't have a chance to try) - while on Mac I had to remove ./ (I need to check on Ubuntu myself)

Answer 1

./rebar is adressing the file in the present workdirectory, only. Starting rebar forces a look-up in the directories in your PATH environment.

If these are the only two options you may add to your script:

REBAR="rebar"
[ -x ./rebar ] && REBAR="./rebar"   # check if rebar is in pwd

$REBAR get-deps
$REBAR compile 
...