maketestdata: 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/maketestdata - from package: clipper

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

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