xargs: 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/xargs - from package: findutils

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

On Debian possible default full paths are:

/usr/bin/xargs - from package: findutils

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

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