nnslog: 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/nnslog - from package: tcllib

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

On Debian possible default full paths are:

/usr/bin/nnslog - from package: tcllib

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

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