tracker-info: 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-info - from package: tracker-utils

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

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