parallel-slurp: 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/parallel-slurp - from package: pssh

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

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