node-supervisor: 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/node-supervisor - from package: nodejs-supervisor

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

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