nit: 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/nit - from package: python-nevow

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

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