spectrum: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/sbin/spectrum - from package: spectrum

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