gnome-split: 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/gnome-split - from package: gnome-split

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

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