tripplitesu: 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:

/sbin/tripplitesu - from package: nut

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

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