Ceos3c

Linux shared memory lets two or more processes read and write the same block of RAM, with no copying through pipes or sockets in between. That makes it the fastest way for processes on one machine to talk. Below are two complete C programs, a writer and a reader, that compile and run as-is, plus … Read more

Linux systemd is the first process that starts on almost every modern distro, and it manages everything after that: services, mounts, timers, logs. Day to day you talk to it with two commands, systemctl to control services and journalctl to read their logs. Learn about 15 commands and one unit file layout and you can … Read more

Linux memory management in one sentence: the kernel uses every bit of RAM your programs aren’t using as disk cache, and hands it back the moment a program needs it. That’s why free often shows almost no “free” memory on a perfectly healthy machine. The number you actually care about is available, not free. Below … Read more