minor writeups
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@ -15,3 +15,9 @@ journalctl --disk-usage && journalctl --vacuum-size={size}M
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```
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or prepare the file`/etc/systemd/journald.conf` and this value:`SystemMaxUse=50M`
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create for all btrfs filesystems a regulary scrub timer.
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```bash
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for p in $(lsblk -nflo FSTYPE,MOUNTPOINT | awk '$1=="btrfs"{print $2}'); do systemctl enable --now "btrfs-scrub@$(systemd-escape -p "$p").timer"; systemctl start "btrfs-scrub@$(systemd-escape -p "$p").service"; done
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```
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the manual way of creating is eating the correct escape.
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edms.md
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edms.md
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# EDMS
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mayan
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paperless-ng
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ocrmypdf
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Hardware-OCR
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## OCR
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## Dateihandling
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fairphone4.md
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fairphone4.md
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---
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keywords:
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- IT
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---
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## Fairphone 4
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https://forum.fairphone.com/t/fp4-debloat-guide-for-better-privacy-security-and-battery-life/80003
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- VoLTE/Voice over WiFi maybe not working (https://forum.fairphone.com/t/how-to-enable-volte-and-wifi-calling/82049)
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-
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## Android
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https://github.com/0x192/universal-android-debloater
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remove search bar from screen [not working]
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`adb shell pm uninstall --user 0 com.google.android.googlequicksearchbox`
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try this: https://lawnchair.app/
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fido2.md
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fido2.md
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---
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keywords:
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- IT
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- Security
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---
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# Fido2
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### features
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- WebAuth
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- main feature, login with username (known value by user), ChallengeResponse ( secret ) and button (interactive)/PIN
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- resident keys
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- HMAC-secret extension
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- symmetric key scoped to a credential
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- https://fidoalliance.org/specs/fido-v2.0-id-20180227/fido-client-to-authenticator-protocol-v2.0-id-20180227.html#sctn-hmac-secret-extension
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## hardware
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#### OpenSK
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#### solo2
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#### nitrokey
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### code snippets
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```[https://gist.github.com/alexgwolff/5d7f6802996cad2847c4a16995da410b]
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Using resident keys If your security key supports FIDO2 resident keys*, like the YubiKey 5 Series, YubiKey 5 FIPS Series, or the Security Key NFC by Yubico, you can enable this when creating your SSH key:
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$ ssh-keygen -t ecdsa-sk -O resident
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This works the same as before, except a resident key is easier to import to a new computer because it can be loaded directly from the security key. To use the SSH key on a new computer, make sure you have ssh-agent running and simply run:
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$ ssh-add -K
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This will load a “key handle” into the SSH agent and make the key available for use on the new computer. This works great for short visits, but it won’t last forever – you’ll need to run ssh-add again if you reboot the computer, for example. To import the key permanently, instead run:
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$ ssh-keygen -K
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This will write two files into the current directory: id\_ecdsa\_sk\_rk and id\_ecdsa\_sk\_rk.pub. Now you just need to rename the private key file to id\_ecdsa\_sk and move it into your SSH directory:
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$ mv id\_ecdsa\_sk\_rk ~/.ssh/id\_ecdsa_sk
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Finally, there’s one more feature to be excited about…
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```
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## references
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https://2fa.directory/int/
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gnuk.md
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gnuk.md
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---
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keywords:
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- IT
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- Security
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---
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## Gnuk
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Passport-opensc:[ https://javacardos.com/tools/passport]( https://javacardos.com/tools/passport)
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4
linux_perf_problems.md
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linux_perf_problems.md
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# debug perfomance problems
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https://netflixtechblog.com/linux-performance-analysis-in-60-000-milliseconds-accc10403c55
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introduction to ebpf: https://www.brendangregg.com/ebpf.html
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linux_shell.md
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linux_shell.md
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![shell-startup.png](shell-startup.png)
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shell-startup.png
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shell-startup.png
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