scide: 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/scide - from package: supercollider-ide

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

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