ibfindnodesusing: 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/sbin/ibfindnodesusing - from package: infiniband-diags

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

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