splay: 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 Debian possible default full paths are:

/usr/bin/splay - from package: splay

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

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