scsh-install-pkg: 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-install-pkg - from package: scsh-install-lib

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

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