fsinfo: 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/fsinfo - from package: am-utils

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

On Debian possible default full paths are:

/usr/bin/fsinfo - from package: python-fs

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

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