ed2k-link: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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 Debian possible default full paths are:

/usr/bin/ed2k-link - from package: rhash

You may install the required package with command apt-get install {package}
Error in other languages:
ed2k-link: bevel nie gevind nie
ed2k-link: comandă negăsită
ed2k-link: comando não encontrado
ed2k-link: commande introuvable
ed2k-link: command not found
ed2k-link: käsku ei ole
ed2k-link: không tìm thấy lệnh
ed2k-link: komanda nerasta
ed2k-link: Kommando nicht gefunden.
ed2k-link: kommandot finns inte
ed2k-link: komut yok
ed2k-link: nie znaleziono polecenia
ed2k-link: níor aimsíodh an t-ordú
ed2k-link: no se encontró la orden
ed2k-link: no s'ha trobat l'ordre
ed2k-link: opdracht niet gevonden
ed2k-link: parancs nem található
ed2k-link: perintah tidak ditemukan
ed2k-link: príkaz nenájdený
ed2k-link: příkaz nenalezen
ed2k-link: команда не найдена
ed2k-link: командата не е открита
ed2k-link: 命令找不到
ed2k-link: コマンドが見つかりません