hikidoc: 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/hikidoc - from package: ruby-hikidoc

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

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