kppplogview: 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/kppplogview - from package: kdenetwork

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

On Debian possible default full paths are:

/usr/bin/kppplogview - from package: kppp

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

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