Useful Bash (or zsh) oneliners

00-oneliners.sh

# Search for files containing a string in a directory and all subdirectories
grep -rl 'string' *

# Search for files and print out the text matching 'string' in those files
grep -r 'string' *

# Stop all docker containers running
docker ps | awk '{ print $1 }' | grep -v CONTAINER | xargs docker stop

# Remove ALL docker containers on host
docker ps -a | awk '{ print $1 }' | grep -v CONTAINER | xargs docker rm

01-commands.txt

grep 
 - searches for text
 - '-r' means "search recursivly" 
 - '-l' means "display only the name of the file"
 - '-v' means "do not display lines that have this string in them"
 
awk 
 - Text formatting tool
 - Can do like, a million things
 - '{ print $1 }' means print column number 1, where the column is seperated by a space. 
 - $0 means pring the entire line
 
xargs
 - Useful command that takes input (stdin) and writes it to the end of the line
 - 'docker ps | awk '{ print $1 }' | grep -v CONTAINER | xargs docker rm'
   - 'docker ps' gets the running containers
   - 'awk' prints the container ID (first column)
   - 'grep -v' removes the top line of text
   - The output is now a list of container IDs
   - xargs "passes" those container IDs to 'docker rm'
     - 'docker rm' will run n number of times where n is the number of lines from ''docker ps | awk '{ print $1 }' | grep -v CONTAINER '