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5_years_of_miscellaneous_notes [2025/02/03 19:01] – dougy1475_years_of_miscellaneous_notes [2025/02/03 19:25] (current) – dougy147
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 <!DOCTYPE markdown> <!DOCTYPE markdown>
  
-:!: Those are random notes I took when confronted to unique or recurrent problems.+:!: This is a //pot pourri// of notes I took when confronted to unique or recurrent problems.
 Be careful as some of them could be obsolete. :-? Be careful as some of them could be obsolete. :-?
  
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 In `/etc/cron.d/certbot` I added `0 */12 * * * root certbot renew --no-random-sleep-on-renew && systemctl restart postfix dovecot` In `/etc/cron.d/certbot` I added `0 */12 * * * root certbot renew --no-random-sleep-on-renew && systemctl restart postfix dovecot`
  
-# Upgrade every OpenWrt packages+# Upgrade every OpenWrt packages at once
  
 ```console ```console
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 ``` ```
  
-# Dump mysql database+# Dump a mysql database
  
 ```console ```console
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 ``` ```
  
-# Sort in place and keep unique+# Sort in place and remove duplicate lines
  
-`sort -uo file.txt{,}`+``` 
 +sort -uo file.txt{,} 
 +```
  
-# Process substitution to filter an output to file but keep whole output in terminal output+# Filter an output to file but keep whole output in terminal output
  
-`echo "hello world" | tee >(grep -o world >> output.txt)`+``` 
 +echo "hello world" | tee >(grep -o world >> output.txt) 
 +```
  
-This will print "hello world" on screen, but keep only "world" in output.txt.+This uses process substitution, and will print "hello world" on the screen, but keep only "world" in output.txt.
  
  
 # Firefox history command line # Firefox history command line
- 
-[https://aurelieherbelot.net/web/read-firefox-history-linux-terminal/](https://aurelieherbelot.net/web/read-firefox-history-linux-terminal/) 
  
 ```console ```console
-# web history sorted by date +# display web history sorted by date 
-$ sqlite3 ~/.mozilla/firefox/**xxxx**.default-release-**xxxx**/places.sqlite "SELECT datetime(moz_historyvisits.visit_date/1000000,'unixepoch'), moz_places.url FROM moz_places, moz_historyvisits WHERE moz_places.id = moz_historyvisits.place_id"|sort+$ sqlite3 ~/.mozilla/firefox/xxxx.default-release-xxxx/places.sqlite "SELECT datetime(moz_historyvisits.visit_date/1000000,'unixepoch'), moz_places.url FROM moz_places, moz_historyvisits WHERE moz_places.id = moz_historyvisits.place_id"|sort
  
-# unique urls visited +# display all unique visited urls 
-$ sqlite3 ~/.mozilla/firefox/**xxxx**.default-release-**xxxx**/places.sqlite "SELECT url FROM moz_places"+$ sqlite3 ~/.mozilla/firefox/xxxx.default-release-xxxx/places.sqlite "SELECT url FROM moz_places"
 ``` ```
  
-# Convert to binary, then back to original format in vim+[https://aurelieherbelot.net/web/read-firefox-history-linux-terminal/](https://aurelieherbelot.net/web/read-firefox-history-linux-terminal/) 
 + 
 +# Convert file to binary then back to original format with vim
  
 Something I have used to modify firmwares when I was tweaking the NB6VAC. Something I have used to modify firmwares when I was tweaking the NB6VAC.
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 8) wireshark should start showing traffic 8) wireshark should start showing traffic
  
-Sources: +- [https://openmaniak.com/ettercap_arp.php](https://openmaniak.com/ettercap_arp.php) 
- +- [https://stackoverflow.com/questions/9555403/capturing-mobile-phone-traffic-on-wireshark](https://stackoverflow.com/questions/9555403/capturing-mobile-phone-traffic-on-wireshark)
-- https://openmaniak.com/ettercap_arp.php +
-- https://stackoverflow.com/questions/9555403/capturing-mobile-phone-traffic-on-wireshark+
  
 # Add zsh interactive comments option # Add zsh interactive comments option
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 Now you can write `echo "this is printed" # this is not` Now you can write `echo "this is printed" # this is not`
  
-# Break lines when compiling ".md" to ".pdf" with pandoc+# Break lines in code blocks when compiling ".md" to ".pdf" with pandoc
  
 Add this to the YAML header options: Add this to the YAML header options:
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 ``` ```
  
-https://www.robotstxt.org/robotstxt.html+[https://www.robotstxt.org/robotstxt.html](https://www.robotstxt.org/robotstxt.html)
  
 # initramfs problem (ERROR: device /dev/mapper/xxx not found, skipping fsck) # initramfs problem (ERROR: device /dev/mapper/xxx not found, skipping fsck)
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 # Check kernel config in Arch Linux # Check kernel config in Arch Linux
- 
-https://unix.stackexchange.com/questions/176307/where-can-i-find-the-kernel-configuration-on-each-linux-distribution 
  
 ``` ```
 zcat /proc/config.gz zcat /proc/config.gz
 ``` ```
 +
 +[https://unix.stackexchange.com/questions/176307/where-can-i-find-the-kernel-configuration-on-each-linux-distribution](https://unix.stackexchange.com/questions/176307/where-can-i-find-the-kernel-configuration-on-each-linux-distribution)
  
 # Check if a streamer is live on Twitch # Check if a streamer is live on Twitch
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 It has vim keybindings! It has vim keybindings!
  
-Source : https://github.com/crosstool-ng/crosstool-ng/issues/1175+[https://github.com/crosstool-ng/crosstool-ng/issues/1175](https://github.com/crosstool-ng/crosstool-ng/issues/1175)
  
-# sed replace if a match occured+# sed replace only if a match occured
  
 I tend to use `grep` and `sed` together : to match, then to replace. But we can match with `sed` : I tend to use `grep` and `sed` together : to match, then to replace. But we can match with `sed` :
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 To prefix the backup "extension" : `-i'bak.*` will produce `bak.file1.txt`, `bak.file2.txt`, etc. To prefix the backup "extension" : `-i'bak.*` will produce `bak.file1.txt`, `bak.file2.txt`, etc.
  
-Source : https://learnbyexample.github.io/learn_gnused/in-place-file-editing.html+[https://learnbyexample.github.io/learn_gnused/in-place-file-editing.html](https://learnbyexample.github.io/learn_gnused/in-place-file-editing.html)
  
 # Useful shortcuts emacs # Useful shortcuts emacs
  
-C-x-;   (maintaining the 3 keys) => comment/uncomment lines +`C-x-;` = comment/uncomment lines. 
-C-x-x -> reselect previous selection+`C-x-x` = reselect previous selection
  
 # Useful commands for git # Useful commands for git
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 I needed to try `bash-3.2` that is the default shell on macOS. Thanks to Docker it's simple : I needed to try `bash-3.2` that is the default shell on macOS. Thanks to Docker it's simple :
  
-`docker run -it bash:3.2`+``` 
 +docker run -it bash:3.2 
 +```
  
 # Change Firefox URL bar size # Change Firefox URL bar size
  
-`about:config` ,  `devp`  , `layout.css.devPixelsPerPx`  => from `-1` to `1.5` (or less or more)+`about:config` =>  `devp`  => `layout.css.devPixelsPerPx` => replace `-1` with `1.5` (or less or more)
  
 # Recursively download a website with wget # Recursively download a website with wget
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 # Check size and sort by size # Check size and sort by size
  
-`du -sh -- * | sort -h`+``` 
 +du -sh -- * | sort -h 
 +```
  
 # Mount an ISO # Mount an ISO
  
-`mount /path/to/image.iso /mnt/iso -o loop`+``` 
 +mount /path/to/image.iso /mnt/iso -o loop 
 +```
  
 # Fonts in ArchLinux # Fonts in ArchLinux
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 Don't forget to change `USER`, `SERVER_URL`: Don't forget to change `USER`, `SERVER_URL`:
  
-`ssh USER@SERVER_URL "sudo -S dd if=/dev/mmcblk0 bs=64k status=progress | gzip -1 -" | dd of=rpiimg.gz bs=64k`+``` 
 +ssh USER@SERVER_URL "sudo -S dd if=/dev/mmcblk0 bs=64k status=progress | gzip -1 -" | dd of=rpiimg.gz bs=64k 
 +```
  
 # Use server as a proxy # Use server as a proxy
  
-`ssh -C2qTnN -D 8080 USER@SERVER_URL`+``` 
 +ssh -C2qTnN -D 8080 USER@SERVER_URL 
 +```
  
 Then in the browser: create a SOCKS proxy with url 127.0.0.1:8080. Then in the browser: create a SOCKS proxy with url 127.0.0.1:8080.
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 # Print from command line # Print from command line
  
-`lpr file.txt -P PRINTER_NAME #tab to find printer`+``` 
 +lpr file.txt -P PRINTER_NAME #tab to find printer 
 +```
  
5_years_of_miscellaneous_notes.1738609283.txt.gz · Last modified: by dougy147
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