icecream: 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/icecream - from package: icecream

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

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