conky: 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/conky - from package: conky

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

On Debian possible default full paths are:

/usr/bin/conky - from package: conky-all
/usr/bin/conky - from package: conky-cli
/usr/bin/conky - from package: conky-std

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

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