gsplit: 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/gsplit - from package: firebird

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

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