efetch: 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 Debian possible default full paths are:

/usr/bin/efetch - from package: acedb-other

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

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