dumpiso: 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/dumpiso - from package: libraw1394

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

On Debian possible default full paths are:

/usr/bin/dumpiso - from package: libraw1394-tools

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

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