pb - DWIM clipboard manipulation

pb.sh

pb() {
  if [[ -p /dev/stdin ]]; then              # STDIN is attached to a pipe
    pbcopy
  fi

  if [[ ! -t 0 && ! -p /dev/stdin ]]; then  # STDIN is attached to a redirect
    pbcopy
  fi

  if [[ -t 1 ]]; then                       # STDOUT is attached to a TTY
    if [[ -t 0 ]]; then                     # STDIN is attached to TTY
      pbpaste
    fi
  fi

  if [[ -p /dev/stdout ]]; then             # STDOUT is attached to a pipe
    pbpaste
  fi

  if [[ ! -t 1 && ! -p /dev/stdout ]]; then # STDOUT is attached to a redirection
    pbpaste
  fi
}

You'll need to source the above to use it as a command:

source ./pb.sh

pb could be used like:

echo text | pb    # copy

or just

pb    # paste

or

echo text | pb | cat -    # copy and paste inline

or

pb </tmp/file >/tmp/file2  # copy from file redirect and paste into file redirect