itweb-settings.itweb: 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/itweb-settings.itweb - from package: icedtea-web

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

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