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Question: create a shell script tcsh or bash that is able...

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Create a shell script (tcsh or bash) that is able to backup all .txt program files in your current directory. If a backup directory does not exist, then ask the user input a backup directory name, and make/create the backup directory (in your current working directory) . If the backup directory was successfully created or already exists For each.txt file: If the file does not exist in the backup directory, then copy the current file to the backup directory and print a message that the file has been backed up. If the file already exists in the backup directory, compare the updated time of the two files; if the backup file is out of date, copy the file and prompt a message, otherwise, do nothing.

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