nohup: 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/nohup - from package: coreutils

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

On Debian possible default full paths are:

/usr/bin/nohup - from package: coreutils

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

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