pshell: 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 CentOS possible default full paths are:

/usr/bin/pshell - from package: python-pyramid

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/pshell - from package: python-pyramid

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

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