cytune: command not found

Have You tried accessing the binary with the full path?

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/bin/cytune - from package: util-linux-ng

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