nylist: 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/nylist - from package: patchy

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

On Debian possible default full paths are:

/usr/bin/nylist - from package: nypatchy

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

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