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→Redirection (Standard Input, Standard Output, Standard Error)
Reference: https://en.wikipedia.org/wiki/Standard_streams
Standard input (stdin) is a term which describes from where a command receives input.
With the examples below, standard input is being sent into the command from the text file.
''Examples:''
'''tr 'a-z' 'A-Z' < words.txt<br>cat < abc.txt<br>sort < xyz.txt'''
===Additional File Manipulation Commands===
