摘要：
What happens when you type this command?$ echo "Hello"HelloTheechocommand accepts the string "Hello" asstandard input, and echoes the string "Hello" b... 阅读全文
摘要：
$:shell prompt (命令提示符)In the terminal, first you see$. This is called ashell prompt. It appears when the terminal is ready to accept a command.When yo... 阅读全文