pkcs15-init: 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/pkcs15-init - from package: opensc

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

On Debian possible default full paths are:

/usr/bin/pkcs15-init - from package: opensc

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

Error in other languages:
pkcs15-init: bevel nie gevind nie
pkcs15-init: comandă negăsită
pkcs15-init: comando não encontrado
pkcs15-init: commande introuvable
pkcs15-init: command not found
pkcs15-init: käsku ei ole
pkcs15-init: không tìm thấy lệnh
pkcs15-init: komanda nerasta
pkcs15-init: Kommando nicht gefunden.
pkcs15-init: kommandot finns inte
pkcs15-init: komut yok
pkcs15-init: nie znaleziono polecenia
pkcs15-init: níor aimsíodh an t-ordú
pkcs15-init: no se encontró la orden
pkcs15-init: no s'ha trobat l'ordre
pkcs15-init: opdracht niet gevonden
pkcs15-init: parancs nem található
pkcs15-init: perintah tidak ditemukan
pkcs15-init: príkaz nenájdený
pkcs15-init: příkaz nenalezen
pkcs15-init: команда не найдена
pkcs15-init: командата не е открита
pkcs15-init: 命令找不到
pkcs15-init: コマンドが見つかりません