ppsh: 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/ppsh - from package: ppsh

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

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