sslget: 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/sslget - from package: pki-native-tools

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

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