kombine: 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/kombine - from package: munipack

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

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