blhc: 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 Debian possible default full paths are:

/usr/bin/blhc - from package: blhc

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

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