tricklectl: 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/tricklectl - from package: trickle

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

On Debian possible default full paths are:

/usr/bin/tricklectl - from package: trickle

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

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