nec2small: 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/nec2small - from package: nec

You may install the required package with command apt-get install {package}
Error in other languages:
nec2small: bevel nie gevind nie
nec2small: comandă negăsită
nec2small: comando não encontrado
nec2small: commande introuvable
nec2small: command not found
nec2small: käsku ei ole
nec2small: không tìm thấy lệnh
nec2small: komanda nerasta
nec2small: Kommando nicht gefunden.
nec2small: kommandot finns inte
nec2small: komut yok
nec2small: nie znaleziono polecenia
nec2small: níor aimsíodh an t-ordú
nec2small: no se encontró la orden
nec2small: no s'ha trobat l'ordre
nec2small: opdracht niet gevonden
nec2small: parancs nem található
nec2small: perintah tidak ditemukan
nec2small: príkaz nenájdený
nec2small: příkaz nenalezen
nec2small: команда не найдена
nec2small: командата не е открита
nec2small: 命令找不到
nec2small: コマンドが見つかりません