psc: 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/psc - from package: sc

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

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