tracker-control: command not found

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-control - from package: tracker

You may install the required package with command apt-get install {package}

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