sgmlnorm: 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/sgmlnorm - from package: opensp

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

On Debian possible default full paths are:

/usr/bin/sgmlnorm - from package: sp

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

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