ibtopodiff: 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/ibtopodiff - from package: ibutils

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

On Debian possible default full paths are:

/usr/bin/ibtopodiff - from package: ibutils

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

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