fcat: 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/bin/fcat - from package: freeze

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

On Debian possible default full paths are:

/usr/bin/fcat - from package: sleuthkit

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

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