p11-kit: 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 CentOS possible default full paths are:

/usr/bin/p11-kit - from package: p11-kit

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/p11-kit - from package: p11-kit

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

Error in other languages:
p11-kit: bevel nie gevind nie
p11-kit: comandă negăsită
p11-kit: comando não encontrado
p11-kit: commande introuvable
p11-kit: command not found
p11-kit: käsku ei ole
p11-kit: không tìm thấy lệnh
p11-kit: komanda nerasta
p11-kit: Kommando nicht gefunden.
p11-kit: kommandot finns inte
p11-kit: komut yok
p11-kit: nie znaleziono polecenia
p11-kit: níor aimsíodh an t-ordú
p11-kit: no se encontró la orden
p11-kit: no s'ha trobat l'ordre
p11-kit: opdracht niet gevonden
p11-kit: parancs nem található
p11-kit: perintah tidak ditemukan
p11-kit: príkaz nenájdený
p11-kit: příkaz nenalezen
p11-kit: команда не найдена
p11-kit: командата не е открита
p11-kit: 命令找不到
p11-kit: コマンドが見つかりません