eblook: 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
/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 Debian possible default full paths are:

/usr/bin/eblook - from package: eblook

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