zhcon: 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/zhcon - from package: zhcon

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

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