ytnefprocess.pl: 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/ytnefprocess.pl - from package: ytnef

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

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