neso: 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/neso - from package: neso

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

On Debian possible default full paths are:

/usr/bin/neso - from package: tryton-neso

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

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