tracker-stats: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/tracker-stats - from package: tracker-utils

You may install the required package with command apt-get install {package}
Error in other languages:
tracker-stats: bevel nie gevind nie
tracker-stats: comandă negăsită
tracker-stats: comando não encontrado
tracker-stats: commande introuvable
tracker-stats: command not found
tracker-stats: käsku ei ole
tracker-stats: không tìm thấy lệnh
tracker-stats: komanda nerasta
tracker-stats: Kommando nicht gefunden.
tracker-stats: kommandot finns inte
tracker-stats: komut yok
tracker-stats: nie znaleziono polecenia
tracker-stats: níor aimsíodh an t-ordú
tracker-stats: no se encontró la orden
tracker-stats: no s'ha trobat l'ordre
tracker-stats: opdracht niet gevonden
tracker-stats: parancs nem található
tracker-stats: perintah tidak ditemukan
tracker-stats: príkaz nenájdený
tracker-stats: příkaz nenalezen
tracker-stats: команда не найдена
tracker-stats: командата не е открита
tracker-stats: 命令找不到
tracker-stats: コマンドが見つかりません