nfslogsum: 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/sbin/nfslogsum - from package: nfswatch

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

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