mizuho-asciidoc: 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/mizuho-asciidoc - from package: rubygem-mizuho
/usr/lib/ruby/gems/1.8/gems/mizuho-0.9.20/bin/mizuho-asciidoc - from package: rubygem-mizuho

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

On Debian possible default full paths are:

/usr/bin/mizuho-asciidoc - from package: ruby-mizuho

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

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