tincd: 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/sbin/tincd - from package: tinc

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

On Debian possible default full paths are:

/usr/sbin/tincd - from package: tinc

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