gsplash: 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/gsplash - from package: splash

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

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