isoqlog: 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/isoqlog - from package: isoqlog

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

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