Symlink my ntfs external hard drive on mount on OSX - /System/Library/LaunchDaemons/com.ejoubaud.symlinkntfsdisk.plist - /Users/ejoubaud/Library/Scripts/symlink_ntfs_disk

com.ejoubaud.symlinkntfsdisk.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" \
"http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<dict>
        <key>Label</key>
        <string>com.ejoubaud.symlinkntfsdisk</string>
        <key>LowPriorityIO</key>
        <true/>
        <key>Program</key>
        <string>/Users/ejoubaud/Library/Scripts/symlink_ntfs_disk.bash</string>
        <key>WatchPaths</key>
        <array>
        <string>/Volumes</string>
        </array>
</dict>
</plist>

symlink_ntfs_disk.bash

#!/bin/bash

DIR=/Volumes

name=`ls -l $DIR | grep ejoubaud | grep Elements | awk 'BEGIN { max = 0 } { max = (max < $10) ? $10 : max } END { print "Elements " max }'`

if [ -d "$DIR/$name" ]; then
  ln -fhs "$DIR/$name" "$DIR/myntfsdisk"
fi