sclient: 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/sclient - from package: krb5-devel
/usr/bin/sclient - from package: krb5-server

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

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