ccsum: 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/lib/wims/bin/ccsum - from package: wims

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

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