polarssl_hello: 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/polarssl_hello - from package: libpolarssl-runtime

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

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