nabi: 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/nabi - from package: nabi

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

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