spectrumctl: 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/spectrumctl - from package: spectrum

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

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