mclpipeline: 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/mclpipeline - from package: mcl

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

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