hugectl: 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
/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/hugectl - from package: libhugetlbfs-utils

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