Linux day to day notes
*1. Disk usage
1.1. Chromium disk usage
I just noticed that Chromium (which I very rarely use) was taking up 1.3GB of space in my .config folder.
Here's how to clean that up: disk usage - Why does Chromium take up 1 GB in my .config and can I reduce th…
Odd that it was taking up so much space, given that my daily driver is Firefox.
1.2. Composer disk usage
composer clearcache
2. Sorting by file size
I keep on running low on space. Disk Usage Analyzer is OK, but for the command line:
du -hs * | sort -h
The -h in both commands is for 'human readable'.
3. Trimming a video from my phone so I can upload it up to Signal
Signal has a 100M upload limit. Plus it'd take ages to upload.
This does the job pretty simply, still good enough quality for sending as a message and reduces the filesize massively:
ffmpeg -i input.mkv -vf "scale=iw/2:ih/2" half_the_frame_size.mkv
4. Shrinking images off my phone for web upload
Quick command to shrink images from my camera for uploading to the web.
mogrify -auto-orient -resize 25% *.jpg
5. Finding out which security updates need installing on a server
sudo unattended-upgrade -v --dry-run
6. Killing a process tree
I seem to need to be doing this more lately on php artisan serve.
Appears to be lots of ways of doing it: https://stackoverflow.com/questions/392022/whats-the-best-way-to-send-a-signal-to-all-members-of-a-process-group
All falling in to the category of https://xkcd.com/1168/
pkill one works OK for me:
ps x | grep 8000 # gives me some process ids, pick the one at the top pkill -TERM -P <pid>
7. ls love
Sort by modified time, in reverse:
ls -ltr
8. git
8.1. find first time a bit of text was added in a repo
git log -S <search string> --source --all