stylus: 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/stylus - from package: nodejs-stylus
/usr/lib/node_modules/stylus/bin/stylus - from package: nodejs-stylus

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

On Debian possible default full paths are:

/usr/bin/stylus - from package: node-stylus
/usr/lib/nodejs/stylus/bin/stylus - from package: node-stylus

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

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