halog: 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/halog - from package: haproxy

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

On Debian possible default full paths are:

/usr/bin/halog - from package: haproxy

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

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