icecc-scheduler: 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 CentOS possible default full paths are:

/usr/sbin/icecc-scheduler - from package: icecream

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/sbin/icecc-scheduler - from package: icecc

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

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