dnssec-triggerd: 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/sbin/dnssec-triggerd - from package: dnssec-trigger

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

On Debian possible default full paths are:

/usr/sbin/dnssec-triggerd - from package: dnssec-trigger

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

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