p11tool: 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/p11tool - from package: gnutls-bin

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

Error in other languages:
p11tool: bevel nie gevind nie
p11tool: comandă negăsită
p11tool: comando não encontrado
p11tool: commande introuvable
p11tool: command not found
p11tool: käsku ei ole
p11tool: không tìm thấy lệnh
p11tool: komanda nerasta
p11tool: Kommando nicht gefunden.
p11tool: kommandot finns inte
p11tool: komut yok
p11tool: nie znaleziono polecenia
p11tool: níor aimsíodh an t-ordú
p11tool: no se encontró la orden
p11tool: no s'ha trobat l'ordre
p11tool: opdracht niet gevonden
p11tool: parancs nem található
p11tool: perintah tidak ditemukan
p11tool: príkaz nenájdený
p11tool: příkaz nenalezen
p11tool: команда не найдена
p11tool: командата не е открита
p11tool: 命令找不到
p11tool: コマンドが見つかりません