Hi ,

Use the below commands for copy ..

To copy a file

cp <source_file> <new_file_name>
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To copy a complete directiory

cp -r <source_dir> <new_dir_name>

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In your case


To copy the complete XYZ dirctory (including all files present under that dir)..

cp -r /home/username/Desktop/XYZ .

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To copy a file


cp /home/username/Desktop/XYZ/<file_name> .


Note: -r means recursive copy