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

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

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