webalizer: 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/webalizer - from package: webalizer

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

On Debian possible default full paths are:

/usr/bin/webalizer - from package: webalizer

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

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