mkdir helloworld
cd helloworld/
go mod init wlsoft.de/hello
go get github.com/robfig/cron/v3
nano hello.go
go build hello.go
$ ll
total 2120
-rw-r--r-- 1 wnf wnf 86 Mar 24 17:49 go.mod
-rw-r--r-- 1 wnf wnf 169 Mar 24 17:49 go.sum
-rwxr-xr-x 1 wnf wnf 2157231 Mar 24 17:50 hello
-rw-r--r-- 1 wnf wnf 229 Mar 24 17:46 hello.go
./hello