ibdmtr: 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/ibdmtr - from package: ibutils

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

On Debian possible default full paths are:

/usr/bin/ibdmtr - from package: ibutils

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

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