xfs_info: 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:

/usr/sbin/xfs_info - from package: xfsprogs

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

On Debian possible default full paths are:

/usr/sbin/xfs_info - from package: xfsprogs

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

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