This Windows batch script identifies and removes all dangling Docker images from your system.

Run example

npm run import -- "Delete danglings images in cmd"

Delete danglings images in cmd

FOR /f "tokens=*" %i IN ('docker images -q -f "dangling=true"') DO docker rmi %i

#!/bin/bash

# Function to remove dangling Docker images
remove_dangling_images() {
  # Get a list of dangling images using Docker
  dangling_images=$(docker images -q -f "dangling=true")

  # Iterate over the list using while loop for better readability
  while IFS= read -r image; do
    # Remove each dangling image
    docker rmi "${image}" || echo "Error removing image ${image}"
  done <<< "$dangling_images"
}

# Call the function to remove dangling images
remove_dangling_images

This code snippet removes all dangling Docker images from the system.

Breakdown:

1. FOR /f "tokens=*" %i IN ('docker images -q -f "dangling=true"'):

   • This is a Windows batch script command.
   • FOR /f iterates over lines of input.
   • "tokens=*" tells it to capture all tokens (words) from each line.
   • %i is a loop variable that will hold each captured token (image ID).
   • 'docker images -q -f "dangling=true"' executes the command docker images -q -f "dangling=true" and pipes its output (IDs of dangling images) to the loop.
     • -q (quiet) flag outputs only image IDs.
     • -f "dangling=true" filters for images that are dangling (not associated with any running or stopped containers).

2. DO docker rmi %i:

   • This is executed for each image ID captured by the loop.
   • docker rmi %i removes the Docker image with the ID stored in %i.

In essence:

• The code identifies dangling Docker images using docker images -q -f "dangling=true".

Here's a breakdown:

• FOR /f "tokens=*" %i IN ('docker images -q -f "dangling=true"') DO: This is a Windows batch script command that iterates over a list of dangling Docker images.

  • FOR /f: This initiates a "for each file" loop.
  • "tokens=*": This tells the loop to capture all tokens (words) from the output of the command inside the parentheses.
  • %i: This is a placeholder variable that will hold each captured token (i.e., each dangling image ID).
  • IN ('docker images -q -f "dangling=true"'): This is the command that generates the list of dangling images.
    • docker images: This command lists Docker images.
    • -q: This flag tells docker images to output only the image IDs.
    • -f "dangling=true": This flag filters the output to only include images that are dangling (not associated with any running or stopped containers).
  • DO: This keyword marks the beginning of the code block that will be executed for each dangling image ID.

• docker rmi %i: This command removes the dangling Docker image specified by the %i variable.

In summary: This code snippet finds all dangling Docker images on your system and then removes them.