I use tech devices a lot, maybe too much, but I don’t dive in too technically. The few times I have to get things done with more technical tools, I need some reference.

CLI - Terminal commands

change screenshot format

defaults write com.apple.screencapture type jpg
killall SystemUIServer

### External links

• awesome-macos-command-line, a GitHub repo by Marcel Bischoff

ExifTool

Scripts for the awesome ExifTool. I use them as part of my photo importing workflow.

All of these scripts must be followed by the path of the image or the directory containing multiple pictures.

Show metadata

exiftool -s -G

-s is used to show the names in ExifTool commands format. e.g.: instead of “Create Date” you see “CreateDate”

-G is used to show the metadata Group to which the metadata tag belongs.

File renaming

Rename files based on their date and time data.

Images shot at the same moment (photo bursts, for example) are being sorted with increasing single-digit indexes.

Since there are many parameters which might contain conflicting times, there are several different tags which can be analyzed. I sorted them such that the first ones are the ones which are more likely to be found but probably not exact, while the last ones are very precise tags, but less likely to be found in an image metadata.

exiftool '-FileName<FileModifyDate' -d %Y.%m.%d\ -\ %H.%M.%S%%c.%%le -r

exiftool '-FileName<DateTimeCreated' -d %Y.%m.%d\ -\ %H.%M.%S%%c.%%le -r

exiftool '-FileName<CreateDate' -d %Y.%m.%d\ -\ %H.%M.%S%%c.%%le -r

exiftool '-FileName<DateTimeOriginal' -d %Y.%m.%d\ -\ %H.%M.%S%%c.%%le -r

exiftool '-FileName<GPSDateTime' -d %Y.%m.%d\ -\ %H.%M.%S%%c.%%le -r

adding -r is used to make the analysis recursive, which means that subfolders are scanned, too.

Directories

Organize files in directories based on each image’s dimensions (resolution)

NOTE: the directories are created in the working directory

"-Directory<imagesize"

Move files to folders based on year and month

exiftool '-Directory<FileModifyDate' -d /path/to/directory/%Y/%Y.%m -r

exiftool '-Directory<DateTimeCreated' -d /path/to/directory/%Y/%Y.%m -r

exiftool '-Directory<CreateDate' -d /path/to/directory/%Y/%Y.%m -r

exiftool '-Directory<DateTimeOriginal' -d /path/to/directory/%Y/%Y.%m -r

exiftool '-Directory<GPSDateTime' -d /path/to/directory/%Y/%Y.%m -r

add -o after exiftool to copy each image instead of moving it.

Sources

Commands above are a personal adaptation of the ones I found from the following sources:

• 9° Below - ExifTool Commands for Image Organization
• exiftool Application Documentation

git

• Dangit, Git!?!

Docker

Notes

• Every docker container has an IP assigned by default
• by default, docker doesn’t assign a terminal to a container when it’s run
• Docker has a built-in DNS serves that allows containers to resolve each other
  • DNS server runs at 127.0.0.11

to list all running containers

docker ps

to list running and non-running containers

docker ps -a

to list all the details about a container

docker inspect some-container

to see all the logs of a container running in a background

docker logs some-container

Run

docker run some-image

• add -d to
• add -it to run an image in an interactive way
  • add -i to check for input
  • add -t to prompt on terminal
• -p 80:5000 port-where-user-access:port-of-docker-container
• to store data in an external directory docker run -v /opt/daradir:/var/lib/some-app some-app
• -e ENVIRONMENT_VARIABLE=VARIABLE some-app to change an environment variable

Networks

To find which network you’re in, use the inspect command

bridge:

private and internal network

none:

no attachment to any network

docker run some-app --network=none

host:

to access from the web

docker run some-app --network=host

Storage

Docker files are in /var/lib/docker

Questions

• how can I know the Docker Host IP address?