c2050: 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/c2050 - from package: c2050

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

On Debian possible default full paths are:

/usr/bin/c2050 - from package: printer-driver-c2050

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

Error in other languages:
c2050: bevel nie gevind nie
c2050: comandă negăsită
c2050: comando não encontrado
c2050: commande introuvable
c2050: command not found
c2050: käsku ei ole
c2050: không tìm thấy lệnh
c2050: komanda nerasta
c2050: Kommando nicht gefunden.
c2050: kommandot finns inte
c2050: komut yok
c2050: nie znaleziono polecenia
c2050: níor aimsíodh an t-ordú
c2050: no se encontró la orden
c2050: no s'ha trobat l'ordre
c2050: opdracht niet gevonden
c2050: parancs nem található
c2050: perintah tidak ditemukan
c2050: príkaz nenájdený
c2050: příkaz nenalezen
c2050: команда не найдена
c2050: командата не е открита
c2050: 命令找不到
c2050: コマンドが見つかりません