vibrate: 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/bin/vibrate - from package: ncbi-data

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

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