mergelog: 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/mergelog - from package: mergelog

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

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