icat: 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 Debian possible default full paths are:

/usr/bin/icat - from package: sleuthkit

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

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