prunehistory: 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/prunehistory - from package: inn2
/usr/lib/news/bin/prunehistory - from package: inn

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

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