dc: 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/dc - from package: bc

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

On Debian possible default full paths are:

/usr/bin/dc - from package: dc
/usr/lib/plan9/bin/dc - from package: 9base

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

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