nypatchy: 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/nypatchy - from package: patchy

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

On Debian possible default full paths are:

/usr/bin/nypatchy - from package: nypatchy

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

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