chronyc: 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/chronyc - from package: chrony

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

On Debian possible default full paths are:

/usr/bin/chronyc - from package: chrony

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

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