clambc: 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/clambc - from package: clamav

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

On Debian possible default full paths are:

/usr/bin/clambc - from package: clamav

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

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