ocsptool: 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/ocsptool - from package: gnutls-bin

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

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