dgsop: command not found

Have You tried accessing the binary with the full path?

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/dgsop - from package: dgc

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