spectool: 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/bin/spectool - from package: rpmdevtools

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