jffs2reader: 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/sbin/jffs2reader - from package: mtd-utils

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

Error in other languages:
jffs2reader: bevel nie gevind nie
jffs2reader: comandă negăsită
jffs2reader: comando não encontrado
jffs2reader: commande introuvable
jffs2reader: command not found
jffs2reader: käsku ei ole
jffs2reader: không tìm thấy lệnh
jffs2reader: komanda nerasta
jffs2reader: Kommando nicht gefunden.
jffs2reader: kommandot finns inte
jffs2reader: komut yok
jffs2reader: nie znaleziono polecenia
jffs2reader: níor aimsíodh an t-ordú
jffs2reader: no se encontró la orden
jffs2reader: no s'ha trobat l'ordre
jffs2reader: opdracht niet gevonden
jffs2reader: parancs nem található
jffs2reader: perintah tidak ditemukan
jffs2reader: príkaz nenájdený
jffs2reader: příkaz nenalezen
jffs2reader: команда не найдена
jffs2reader: командата не е открита
jffs2reader: 命令找不到
jffs2reader: コマンドが見つかりません