suck: 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/suck - from package: suck

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

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