rassplit: 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/rassplit - from package: ncl

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

On Debian possible default full paths are:

/usr/bin/rassplit - from package: ncl-ncarg

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

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