nip2: command not found

Have You tried accessing the binary with the full path?

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/nip2 - from package: nip2

You may install the required package with command apt-get install {package}
Error in other languages:
nip2: bevel nie gevind nie
nip2: comandă negăsită
nip2: comando não encontrado
nip2: commande introuvable
nip2: command not found
nip2: käsku ei ole
nip2: không tìm thấy lệnh
nip2: komanda nerasta
nip2: Kommando nicht gefunden.
nip2: kommandot finns inte
nip2: komut yok
nip2: nie znaleziono polecenia
nip2: níor aimsíodh an t-ordú
nip2: no se encontró la orden
nip2: no s'ha trobat l'ordre
nip2: opdracht niet gevonden
nip2: parancs nem található
nip2: perintah tidak ditemukan
nip2: príkaz nenájdený
nip2: příkaz nenalezen
nip2: команда не найдена
nip2: командата не е открита
nip2: 命令找不到
nip2: コマンドが見つかりません