$ brew tap mitakeck/oreillyfreebook
$ brew install oreillyfreebook

$ chmod +x oreillyfreebook_*
$ mv oreillyfreebook_* /usr/loca/bin/oreillyfreebook

$ go get github.com/mitakeck/oreillyfreebook
$ cd $GOPATH/src/github.com/mitakeck/oreillyfreebook
$ go install

$ oreillyfreebook -d directory [-f format] [-c category] [-s search-word]

options
  -d directory    Specify the directory to save
  -f format       Specify the ebook format to download; the default is "pdf"
                  "pdf", "mobi", "epub"
  -c category     Specify the ebook category to download;
                  if not specified, all categories will be download
                  "business", "design", "iot", "data", "programming",   "security", "web-platform", "webops"
  -s search-word  Specify the search word for ebook

$ # ex) download all free ebook
$ oreillyfreebook -d files
Download : files/2016-data-science-salary-survey.pdf
Download : files/business-models-for-the-data-economy.pdf
Download : files/embedding-analytics-in-modern-applications.pdf
Download : files/mapping-big-data.pdf
Download : files/data-science-microsoft-azure-ml-python.pdf
...

$ # ex) download iot category
$ oreillyfreebook -d files -c iot
Download : files/ambient-computing.pdf
Download : files/governing-the-iot.pdf
Download : files/creating-functional-teams-for-iot.pdf
Download : files/iot-opportunities-challenges.pdf
...