ccguess: 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/ccguess - from package: ccrypt

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

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