fstab-decode: 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/fstab-decode - from package: initscripts

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

On Debian possible default full paths are:

/sbin/fstab-decode - from package: sysvinit-utils

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

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