pskctool: 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/pskctool - from package: pskctool

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

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