How to Write Logs to Systemd Journal Using syslog, printf, and sd_journal in Linux

This article demonstrates three methods for sending logs to the systemd journal—using the libc syslog() function, capturing stdout/stderr via printf(), and employing the native systemd sd_journal API—complete with C, Python, and Bash examples, service setup, and log filtering techniques.

C programmingjournallogging

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How to Write Logs to Systemd Journal Using syslog, printf, and sd_journal in Linux