nysynopt: 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/nysynopt - from package: patchy

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

On Debian possible default full paths are:

/usr/bin/nysynopt - from package: nypatchy

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

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