nano-tiny: 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:

/bin/nano-tiny - from package: nano-tiny

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