sunclock: 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/sunclock - from package: sunclock

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

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