go-dag-summary: 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/go-dag-summary - from package: libgo-perl

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

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