There are development tools, which are useful and powerful, and their common commands in this chapter.

#

Idiolect

• < and >
  It indicates where to fill in the specified information.

  sleep <second>
  syntax
  

  sleep 1
  example

• ?
  The specified information may emerge zero or one time.

  docker pull <repository>:<tag>?
  syntax
  

  docker pull nginx
  docker pull nginx:latest
  example

• *
  The specified information may emerge zero or several times.

  docker-compose up -d <service name>*
  syntax
  

  docker-compose up -d
  docker-compose up -d mongo
  docker-compose up -d mongo mongo-express
  example

• |
  It indicates the union of different information, choosing one to fill in.

  docker run <image id|repository>
  syntax
  

  docker run 4ea8fc7babb5
  docker run mongo
  example

• ( and )
  It indicates a single choice and is used with | to list options.

  lsof -i (tcp|udp)
  syntax
  

  lsof -i tcp
  lsof -i udp
  example