gunbatch: 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/lib/news/bin/rnews.libexec/gunbatch - from package: inn2-inews

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

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