scrapy:tldr:1a91f

The command "scrapy crawl ${spider_name}" is used to run a spider in Scrapy, a web scraping framework in Python.

• "scrapy" is the command-line tool used to interact with Scrapy and execute various operations such as running spiders.
• "crawl" is a command used to start a crawling process using a particular spider.
• "${spider_name}" is a placeholder that should be replaced with the actual name of the spider you want to run. The spider_name is provided as an argument to the "crawl" command.

For example, if you have a spider named "my_spider", you would replace "${spider_name}" with "my_spider" and execute the command as: "scrapy crawl my_spider".

When this command is executed, Scrapy will start the spider specified by the "spider_name" and initiate the crawling process, which involves sending HTTP requests, parsing responses, and scraping data from the targeted website according to the instructions defined in the spider's code.