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

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

On Debian possible default full paths are:

/usr/sbin/iblinkinfo - from package: infiniband-diags

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

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