skillet: 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/skillet - from package: fawkes-plugin-skiller

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

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