trickle: 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/trickle - from package: trickle

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

On Debian possible default full paths are:

/usr/bin/trickle - from package: trickle

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

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