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docker

Images

docker images

List all images

docker build -t name:tag .

Build an image from Dockerfile

Example: docker build -t myapp:1.0 .

docker build -t <image_name> . –no-cache

Build an Image from a Dockerfile without the cache

docker pull <image>

Pull an image from registry

docker rmi <image>

Remove an image

docker tag <source> <target>

Tag an image

docker image prune

Remove all unused images

Containers

docker ps

List running containers

docker ps -a

List all containers (including stopped)

docker run -d -p host:container image

Run container in detached mode with port mapping

Example: docker run -d -p 8080:80 nginx

docker run -it --rm -v /path/on/host:/path/in/container <image> sh

Run container in interactive mode with volume mount. Remove container once the container is stopped

docker exec -it <container> /bin/sh

Executes an interactive shell inside an already running container

docker stop <container>

Stop a running container

docker start <container>

Start a stopped container

docker rm <container>

Remove a container

docker exec -it <container> bash

Execute interactive bash in container

docker logs <container>

View container logs

docker logs -f <container>

Follow container logs

docker inspect <container>

To inspect a running <container_name> (or <container_id>)

docker container stats

View resource usage stats

docker port <container>

Show port binding to host

System

docker system prune -a

Remove all unused containers, networks, images

docker system df

Show docker disk usage

docker info

Display system-wide information

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awk

awk '{print $1}'

Print first column

awk '{print $NF}'

Print last column

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git

Common

git status

Show working tree status

git add <file>

Stage changes for commit

git commit -m 'message'

Commit staged changes

git push origin <branch>

Push commits to remote

git pull

Fetch and merge remote changes

git branch -a

List all branches

git checkout -b <branch>

Create and switch to new branch

git merge <branch>

Merge branch into current branch

git log --oneline

Show commit history (compact)

git diff

Show unstaged changes

git reset --hard HEAD

Discard all local changes

git stash

Temporarily save changes

git stash pop

Restore stashed changes

ls-files

git ls-files --others --exclude-standard

To list untracked files

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sed

sed 's/pattern/replacement/'

Replace first occurrence per line

Example: sed 's/foo/bar/' file.txt

sed 's/pattern/replacement/g'

Replace all occurrences

sed -i 's/pattern/replacement/g'

Edit file in-place

sed -n '5,10p'

Print lines 5 to 10

sed '/pattern/d'

Delete lines matching pattern

sed '5d'

Delete line 5

sed -n '/pattern/p'

Print only matching lines

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grep

grep 'pattern' file

Search for pattern in file

grep -r 'pattern' dir/

Recursively search directory

grep -i 'pattern' file

Case-insensitive search

grep -v 'pattern' file

Invert match (exclude pattern)

grep -n 'pattern' file

Show line numbers

grep -c 'pattern' file

Count matching lines

grep -A 3 'pattern' file

Show 3 lines after match

grep -B 3 'pattern' file

Show 3 lines before match

grep -E 'pattern1|pattern2' file

Extended regex (OR)

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ss

ss -tlnp

List all open TCP connections