pscal: 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/pscal - from package: xcal

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

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