upslog: 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/upslog - from package: nut

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

On Debian possible default full paths are:

/bin/upslog - from package: nut-client

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

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