csfcalc: 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/csfcalc - from package: clipper

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

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