id16: 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/id16 - from package: simh

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

Error in other languages:
id16: bevel nie gevind nie
id16: comandă negăsită
id16: comando não encontrado
id16: commande introuvable
id16: command not found
id16: käsku ei ole
id16: không tìm thấy lệnh
id16: komanda nerasta
id16: Kommando nicht gefunden.
id16: kommandot finns inte
id16: komut yok
id16: nie znaleziono polecenia
id16: níor aimsíodh an t-ordú
id16: no se encontró la orden
id16: no s'ha trobat l'ordre
id16: opdracht niet gevonden
id16: parancs nem található
id16: perintah tidak ditemukan
id16: príkaz nenájdený
id16: příkaz nenalezen
id16: команда не найдена
id16: командата не е открита
id16: 命令找不到
id16: コマンドが見つかりません