clog: 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/clog - from package: clog

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

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