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Added diff -r command example and explanation in directories_comparison.md (#10596)
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exercises/shell/solutions/directories_comparision.md
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exercises/shell/solutions/directories_comparision.md
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## How to compare two directories in Linux?
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You can use the 'diff' command with the '-r' flag to compare two direcotries recursively.
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### Example:
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'''bash
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diff -r folder1/ folder2/
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This command compares all the files and subdirectories inside 'folder1' and 'folder2'.
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If both directories have identical contents, it retuns nothing.
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If there are differences,it showss which files differ or are missing.
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