Table of Contents 1.00 Introduction 1.01 Document Conventions 1.02 Copyright Notice 1.03 Feedback 2.00 Linux 3.00 Terminology 4.00 Directory Structure 5.00 Commands 5.01 Help Utilities 5.02 Files/Directories Utilities 5.03 Users and System Information Utilities 5.04a Permissions 5.04b Ownership, Permissions and Links Utilities 5.05 Hardware Utilities 5.06 Filter Utilities 5.07 Location Utilities 5.08 De&Compression Utilities 5.09 Jobs control Utilities 5.10 Networking Utilities 5.11 System & Admin and other Utilities 6.00 Symbols, Expansions 6.01 Key Combinations 6.02 Redirection Operators 6.03 Symbol Commands 6.04 File Descriptor 6.05 File Types (long list) 6.06 Wildcards 6.07 Common Regular Expressions 6.08 Extended Regular Expressions 7.00 Parameters and Variable, Attributes 7.01 Variable Commands 7.02 User Created Variables 7.03 Special Modifiers 7.04 Bash Keyword Variables 7.05 Positional Parameters 7.06 Escape Sequance 8.0 Vim 9.0 Scripts 10.00 Conclusion unnamed1
6.04 File Descriptors
Symbol
Description
0
(standard input; Abbreviation stdin ),
1
(standard output; Abbreviation stdout),
2
(standard error; Abbreviation stderr)
Example:
[bash]$ cat xy 1> hold1 2>
Example: 2>&1 duplicating a file descriptor (declares file descriptor 2 to be a duplicate of file descriptor 1)
[bash]$ cat xy 1> hold 2>&1
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