doccentral: command not found

Have You tried accessing the binary with the full path?

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/doccentral - from package: doc-central

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