cecalc: 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/cecalc - from package: clipper

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

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