openpgp-tool: 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/openpgp-tool - from package: opensc

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

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