tune2fs: 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/tune2fs - from package: e2fsprogs

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

On Debian possible default full paths are:

/sbin/tune2fs - from package: e2fsprogs
/usr/lib/debug/sbin/tune2fs - from package: e2fsprogs-dbg

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

Error in other languages:
tune2fs: bevel nie gevind nie
tune2fs: comandă negăsită
tune2fs: comando não encontrado
tune2fs: commande introuvable
tune2fs: command not found
tune2fs: käsku ei ole
tune2fs: không tìm thấy lệnh
tune2fs: komanda nerasta
tune2fs: Kommando nicht gefunden.
tune2fs: kommandot finns inte
tune2fs: komut yok
tune2fs: nie znaleziono polecenia
tune2fs: níor aimsíodh an t-ordú
tune2fs: no se encontró la orden
tune2fs: no s'ha trobat l'ordre
tune2fs: opdracht niet gevonden
tune2fs: parancs nem található
tune2fs: perintah tidak ditemukan
tune2fs: príkaz nenájdený
tune2fs: příkaz nenalezen
tune2fs: команда не найдена
tune2fs: командата не е открита
tune2fs: 命令找不到
tune2fs: コマンドが見つかりません