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→Redirection (Standard Input, Standard Output, Standard Error)
'''Standard input''' ('''stdin''') is a term which describes from where a command receives input.<br>
This would apply only to Unix/Linux commands that accept stdin input (like ''cat'', ''more'', ''less'', ''sort'', ''grep'', ''head'', ''tail'', etc.).<br>
''Examples:''
<span style="font-family:courier;font-weight:bold">PWD<br>PWD 2> error-message.txt<br>PWD 2 >> error-messages.txt<br>PWD 2> /dev/null</span>
===Additional File Manipulation Commands===
