nickle: 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/nickle - from package: nickle

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

On Debian possible default full paths are:

/usr/bin/nickle - from package: nickle

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

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