freeze: 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/bin/freeze - from package: freeze

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

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