xml2end: 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/xml2end - from package: bibutils

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

On Debian possible default full paths are:

/usr/bin/xml2end - from package: bibutils

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

Error in other languages:
xml2end: bevel nie gevind nie
xml2end: comandă negăsită
xml2end: comando não encontrado
xml2end: commande introuvable
xml2end: command not found
xml2end: käsku ei ole
xml2end: không tìm thấy lệnh
xml2end: komanda nerasta
xml2end: Kommando nicht gefunden.
xml2end: kommandot finns inte
xml2end: komut yok
xml2end: nie znaleziono polecenia
xml2end: níor aimsíodh an t-ordú
xml2end: no se encontró la orden
xml2end: no s'ha trobat l'ordre
xml2end: opdracht niet gevonden
xml2end: parancs nem található
xml2end: perintah tidak ditemukan
xml2end: príkaz nenájdený
xml2end: příkaz nenalezen
xml2end: команда не найдена
xml2end: командата не е открита
xml2end: 命令找不到
xml2end: コマンドが見つかりません