ne: 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/bin/ne - from package: ne

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

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