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tech/combine-multiple-pdf-files-into-one-from-command-line-in-mac/

Combine multiple PDF files into one from command line in Mac - Deepan Seeralan

Recently I downloaded some reference materials that came in a bunch of PDF files. I wanted to stitch them into one file so I can read or print more comfortably. I knew I can do this with the Preview app by drag-and-dropping multiple PDF files in the order I wanted to combine. Since I had few dozen files, I wasn’t interested in doing this manually. If Preview can do it, there must be some ways to do that from command line too. That way, I can automate this with a bash script to go over mulitple files. The solution turned out much simpler than I thought, thanks to this post.

https://www.deepanseeralan.com/tech/combine-multiple-pdf-files-into-one-from-command-line-in-mac/

tech/playing-with-shared-memory/

Playing with shared memory in Linux and macOS - Deepan Seeralan

Reading the operating system internals is like going down the rabbit hole. It is so easy start at one topic, get lost and end up in a totally different topic. On one such journey sometime back, I ended up at shared memory, one of the frequently used inter process communication mechanisms. If we are to communicate between parent and child processes, we could do so through a memory region in the parent’s address space since that is accessible to the child process as well. Here is an example.

https://www.deepanseeralan.com/tech/playing-with-shared-memory/

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