todo

[Shell] Run and understand: Output the default environment variables

[dirname] Run and understand Remove the last segment from the path and display

[cat] Run and understand Output variables as strings with heredocument

[cat] Run and understand Output variable string with heredoc

[find] Run and understand Enter the results of find into the for statement

[echo] Run and understand Correctly output spaces in quote

[shell script] Run and understand Get and display all arguments

[shell script] Run and understand Get the number of elements

[shell script] Run and understand Create a folder from shell script arguments

[node] Run and understand. Execute the node command to execute a named function