itweb-settings: 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 Debian possible default full paths are:

/usr/lib/jvm/java-6-openjdk-amd64/jre/bin/itweb-settings - from package: icedtea-netx
/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/itweb-settings - from package: icedtea-netx

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

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