nss-config: 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/nss-config - from package: nss-devel

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

On Debian possible default full paths are:

/usr/bin/nss-config - from package: libnss3-dev

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

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