Automate safe system upodates with a single script (for APT + systemd systems)

THE PROBLEM Keeping a Linux system fully updated usually means doing several things by hand: Update APT package lists Upgrade installed packages Remove unused dependencies and cached files Update Flatpak apps (if you use Flatpak) Update firmware via fwupd (if available) Decide whether to reboot or shut down None of that is hard, but it is repetitive and easy to skip steps, especially firmware updates. This script turns that whole workflow into a single, safe command. REQUIREMENTS This script assumes: Package manager Uses APT Example: Debian, Ubuntu, Linux Mint and similar Init system Uses systemd (for systemctl reboot/poweroff) Shell bash (script uses “#!/usr/bin/env bash” and “set -euo pipefail”) You can run it with: bash script.sh Privileges Your user has sudo rights Optional components Flatpak (optional) If not installed, Flatpak steps are skipped fwupd (fwupdmgr, optional) If not installed, firmware steps a...
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Filtering and transforming texts via stream editing: SED

SED

SED processes the indicated lines in a file, and makes operations such as string substitution basing on the given parameters. The basic output is displayed, but you can write it into a file with ">" as usual.

$ sed s/pattern/replace_string/ file
Substitute first string occurrence in every line

$ sed s/pattern/replace_string/g file
Substitute all string occurrences in every line

$ sed 1,4s/pattern/replace_string/g file
Substitute all string occurrences in the range 1-4 of lines

$ sed -i s/pattern/replace_string/g file
Save changes for string substitution in the same file

To convert 01/02/… to SUN/MON/…
$ sed -e 's/01/SUN/'-e 's/02/MON/' -e 's/03/TUE/' -e 's/04/WED/' -e 's/05/THU/' -e 's/06/FRI/'  -e 's/07/SAT/'



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