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Upserts and Inserts

Insert a document _id is a 12 bytes hexadecimal number which assures the uniqueness of every document. You can provide _id while inserting the document. If you didn’t provide then …

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Bash Script Copying (cp)

OptionDescription-a,-archiveCombines the d, p and r options-b, -backupBefore removal, makes a backup-d, –no-deferencePreserves links-f, –forceRemove existing destinations without prompting user-i, –interactiveShow prompt before overwriting-l, –linkInstead of copying, link files instead-p, …

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