xsldbg: 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/xsldbg - from package: kdewebdev

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

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