isoquery: 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/isoquery - from package: isoquery

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

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