Shell use clipboard to copy and paste

copy

• copy text file content to clipboard
  pbcopy < file.txt

• copy command stdout to clipboard
  ps aux | pbcopy

• copy text
  echo text | pbcopy

paste

• paste from clipboard to file
  pbpaste > file.txt

filter string
pbpaste | grep "hello" > file2.txt

• echo text from clipboard
  echo | pbpaste

Reference

• https://www.macobserver.com/tips/quick-tip/use-clipboard-in-terminal-without-mouse/