nycheck: 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/nycheck - from package: patchy

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

On Debian possible default full paths are:

/usr/bin/nycheck - from package: nypatchy

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

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