ssl-cert-check: 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/ssl-cert-check - from package: ssl-cert-check

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

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