monotone-server: 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/sbin/monotone-server - from package: monotone-server

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

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