zcav: 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/zcav - from package: bonnie++

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

On Debian possible default full paths are:

/usr/sbin/zcav - from package: bonnie++

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

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