scsh: 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/scsh - from package: scsh

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

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