collectd: 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/collectd - from package: collectd

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

On Debian possible default full paths are:

/usr/sbin/collectd - from package: collectd-core
/usr/lib/debug/usr/sbin/collectd - from package: collectd-dbg

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

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