You can use a singlesource by using a combination of command-line tools and shell flow control (such as if or case) to select the various options to use.
通过使用命令行工具和外壳流控制(如if或case)的组合,您可以使用单个源来选择各种要使用的选项。
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For example, you can remove multiple blank lines with a single blank line (use the -s option), which is a good way to clean up source code before showing it to the world.