puttytel: 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/puttytel - from package: putty

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

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