Mac terminal permission denied

You'll want to use ./orca instead of just orca. In OS X, the current directory (.) isn't in $PATH by default, so you can't execute programs in the current directory without explicitly naming it.

To investigate your issue with startup rc files, you can generate trace for each command, e.g.:

1. Edit /etc/profile (e.g. sudo vim /etc/profile).
2. Append set -x at the end of the file.
3. Open new Terminal window and it'll show the trace output.

Having trace output, you can easily identify the source of your Permission denied issue (by search for it via: ⌘+f). Once you remove the problematic line, get rid of set -x which you've appended.