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/asciidoc - from package: asciidoc

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

On Debian possible default full paths are:

/usr/bin/asciidoc - from package: asciidoc

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

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