cp is the Linux copy file command. cp has many options.
cp file1.txt file2.txt
The basic form of the copy command copies one file from one location to another.
cp -p file1.txt file1org
One useful variation of the command is to preserve all the attributes of the source file. In this case, the source files is file1.txt.
cp -rp /home/* /mnt/backup/home
The recursive option can be added to the perserve option. This combination of options is helpful during the recovery of a failed system. knoppix can be used to mount a bad harddrive. You can attempt to use the copy command to copy all the files that are salvagable.