jfs_debugfs: 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:

/sbin/jfs_debugfs - from package: jfsutils

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

On Debian possible default full paths are:

/sbin/jfs_debugfs - from package: jfsutils

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

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