bin$ which tesseract
/opt/local/bin/tesseract

bin$ ls /opt/local/bin/tesseract
-rwxr-xr-x  1 root  admin  28120 15 Sep  2016 /opt/local/bin/tesseract

bin$ ls /opt/local/ | grep bin
drwxr-xr-x  719 root  admin  24446  6 Aug 19:55 bin

bin$ which packer
/usr/local/bin/packer

bin$ ls /usr/local/bin/packer
lrwxr-xr-x  1 myuser  admin  33  7 Aug 14:28 /usr/local/bin/packer -> ../Cellar/packer/1.2.5/bin/packer

bin$ ls /usr/local | grep bin
drwxrwxr-x  41 myuser  admin  1394  7 Aug 14:28 bin

/opt/local/bin  #macports
/usr/local/bin  #homebrew
/usr/bin        #Apple binaries

drwxr-xr-x  26 root  wheel  -                 884 Oct 17 03:36 bin