pscss: 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/pscss - from package: php-scssphp

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

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