Category Archives: UNIX & Linux

Too good to #0008

Posted on 7. March 2023 by #!/bin/blog

rinetd-style circuit level gateway in systemd This accepts port 465/tcp and forwards all connections to a service running somewhere else on 1194/tcp. The socket unit accepts the connection on port 465: systemd-socket-proxyd connects to the backend: (Anyone old enough to … Continue reading →

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“OMG, I see you have committed a manual page…”

Posted on 4. March 2023 by #!/bin/blog

…and this is how it’s done, the simplest way possible. I initially heard about this technique from Jan-Piet Mens, a large-scale fiddler unlike me, and have fully committed to it. Continue reading →

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Too good to #0007

Posted on 1. February 2023 by #!/bin/blog

Disable the dynamic motd on Ubuntu and everywhere else This is without messing around in /etc/pam.d or doing things that may be reverted by future updates. Remember to systemctl enable disable-dynamic-motd.timer. Disable verbose logging on realmd.service Problem on AD-member Linux … Continue reading →

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systemd-Timer für Crontab-User

Posted on 27. December 2022 by #!/bin/blog

Ich bin wirklich dazu übergangen, mich komplett auf systemd-Timer statt Crontab-Einträge einzulassen, lediglich die Zeitangaben für kalendergebundene Events machen mir dauerhaft zu schaffen. Mir ist ein Rätsel, dass die allwissenden systemd-Entwickler darauf verzichtet haben, eine zusätzliche Konfigurationsmöglichkeit über die bekannten, selbsterklärenden und intuitiv verständlichen Crontab-Spezifikationen zu akzeptieren. Hier also eine Handvoll Beispiele. Continue reading →

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IBM RS/6000 von 1993

Posted on 30. November 2022 by #!/bin/blog

Von den Leuten, die uns “STRG”, “ENTF” und “EINFG” gebracht haben, ein Highlight, das sich leider nie durchgesetzt hat: Die GRDST-Taste. Continue reading →

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Too good to #0006

Posted on 20. November 2022 by #!/bin/blog

“Sudo on demand” from TGT0003 considered more useful for downgrading privileges on the fly JSON export of all installed packages on Debian/Ubuntu Urlwatch for a new version of a package in the Ubuntu package pool

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Letsencrypt und DNS Round-Robin

Posted on 16. November 2022 by #!/bin/blog

Ich weiß jetzt wieder, wie ich Letsencrypt auf DNS Round-Robin mit zwei Servern aufgesetzt hatte und finde es auch mit einigen Jahren Abstand gar nicht mal so schrecklich. Continue reading →

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Too good to #0005

Posted on 1. November 2022 by #!/bin/blog

Prioritizing own NTP servers for systemd-timesyncd Test if text is empty (even if it does contain a linebreak) Good job by: https://unix.stackexchange.com/q/386499/2028 Watch for changes in the Gnome registry (To reproduce manual changes, for configuration management.) Trigger Debian/Ubuntu unattended-upgrade (For … Continue reading →

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Too good to #0004

Posted on 7. October 2022 by #!/bin/blog

systemd, the good parts: monotonic timers When systemd makes you suffer because “run job every 10 minutes” is infinitely harder to specify than in crontab, remember there are monotonic timers in systemd that aren’t derived from wallclock time, or “Calendar … Continue reading →

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Too good to #0003

Posted on 22. September 2022 by #!/bin/blog

Linux uptime in seconds, once and for all “Sudo on demand”, re-exec shell script with sudo if not running as root See also TGT0006, this is just as useful for downgrading privileges on the fly. “When was the last time … Continue reading →

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