eggdrop: 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/eggdrop - from package: eggdrop

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

On Debian possible default full paths are:

/usr/bin/eggdrop - from package: eggdrop

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

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