Bash general content

bash_general.md

Execute Linux command from txt

• Example:
  • Markdown file with text and code together
  • Inside Markdown you have a sequence of lines like:

    1. Use docker compose file in this folder (compose-zoo-kafka-postg.yaml) to set a zoo-keeper, a kafka, and a Postgree DB
    2. To enable this environment, use the command: $ docker compose -f compose-zoo-kafka-postg.yaml up -d
    3. To access the "kafka terminal", use the command: $ docker exec -it kafka bash
    4. To disable this environment, use the command: $ docker compose -f compose-zoo-kafka-postg.yaml down
    

  • Then you can use following commands to execute those commands straight from file:

      $(cat README.md | grep docker | grep up | cut -d "$" -f2)
      $(cat README.md | grep docker | grep down | cut -d "$" -f2)
    

• Brief explanation:
  • Command cat "print" the file
  • | enable you to add command into the output of the previous command
  • grep enable you to search for a string inside a text and return the lines where this text exists
  • cut -d <character you're looking for> -f2 enable you to get the text after the "character you're looking for"
  • $(<cmd>) enable you to execute the "cmd"