cstocs: 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/cstocs - from package: cstocs

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

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