yapet2csv: 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/yapet2csv - from package: yapet

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

On Debian possible default full paths are:

/usr/bin/yapet2csv - from package: yapet

You may install the required package with command apt-get install {package}

Error in other languages:
yapet2csv: bevel nie gevind nie
yapet2csv: comandă negăsită
yapet2csv: comando não encontrado
yapet2csv: commande introuvable
yapet2csv: command not found
yapet2csv: käsku ei ole
yapet2csv: không tìm thấy lệnh
yapet2csv: komanda nerasta
yapet2csv: Kommando nicht gefunden.
yapet2csv: kommandot finns inte
yapet2csv: komut yok
yapet2csv: nie znaleziono polecenia
yapet2csv: níor aimsíodh an t-ordú
yapet2csv: no se encontró la orden
yapet2csv: no s'ha trobat l'ordre
yapet2csv: opdracht niet gevonden
yapet2csv: parancs nem található
yapet2csv: perintah tidak ditemukan
yapet2csv: príkaz nenájdený
yapet2csv: příkaz nenalezen
yapet2csv: команда не найдена
yapet2csv: командата не е открита
yapet2csv: 命令找不到
yapet2csv: コマンドが見つかりません