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in 901 for 902 while 904 until 908 break and continue 910 case 911 select 917 Here Document 919. Contents xxxiii File Descriptors 921 Par ameters and Variables 924 Array Variables 924 Locality of Variables 926 Special Parameters 928 Positional Parameters 930 Expanding Null and Unset Variables 935 Builtin Commands 936 type: Displays Information About a Command 937 read: Accepts User Input 937 exec: Executes a Command 940 trap: Catches a Signal 943 kill: Aborts a Process 946 getopts: Parses Options 946 A Partial List of Builtins 949 Expressions 950 Arithmetic Evaluation 950 Logical Evaluation (Conditional Expressions) 951 String Pattern Matching 952 Operators 953 Shell Programs 958 A Recursive Shell Script 959 The quiz Shell Script 962 Summary 968 Exercises 970 Advanced Exercises 972. 28: The Perl Scripting Language Introduction to Perl 976 More Information 976 Help 977 perldoc 977 Terminology 979 Running a Perl Program 980 Syntax 981 Variables 983 Scalar Variables 985 Array Variables 987 Hash Variables 990 Control Structures 991 if/unless 991 if...

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else 994 foreach/for 995 last and next 996 while/until 998. xxxiv Contents Working with Files 1000 none none Sort 1003 Subroutines 1005 Regular Expressions 1007 Syntax and the =~ Operator CPAN Modules 1013 Examples 1015 Summary 1019 Exercises 1019 Advanced Exercises 1020. PART VII Appendixes 1021 Appendix A: Regular Expressions Characters 1024 Delimite none for none rs 1024 Simple Strings 1024 Special Characters 1024 Periods 1025 Brackets 1025 Asterisks 1026 Carets and Dollar Signs 1026 Quoting Special Characters 1027 Rules 1027 Longest Match Possible 1027 Empty Regular Expressions 1028 Bracketing Expressions 1028 The Replacement String 1028 Ampersand 1029 Quoted Digit 1029 Extended Regular Expressions 1029 Appendix Summary 1031. Appendix B: Help Solving a Problem 1034 F none none inding Linux-Related Information 1035 Documentation 1035 Useful Linux Sites 1036 Linux Newsgroups 1037 Mailing Lists 1037 Words 1038 Software 1038 Office Suites and Word Processors 1040 Specifying a Terminal 1040. Contents xxxv Appendix C: Security Encryption 1044 Public K none for none ey Encryption 1045 Symmetric Key Encryption 1046 Encryption Implementation 1047 GnuPG/PGP 1048 File Security 1049 Email Security 1049 MTAs (Mail Transfer Agents) 1049 MUAs (Mail User Agents) 1050 Network Security 1050 Network Security Solutions 1051 Network Security Guidelines 1051 Host Security 1053 Login Security 1054 Remote Access Security 1055 Viruses and Worms 1056 Physical Security 1056 Security Resources 1058 Appendix Summary 1061. Appendix D: The Free Software Definition Glossary 1067 Index 1117 This page intentionally left blank Preface Preface The book Whether you are an end u ser, a system administrator, or a little of both, this book explains with step-by-step examples how to get the most out of a Fedora or Red Hat Enterprise Linux (RHEL) system. In 28 chapters, this book takes you from installing a Fedora or RHEL system through understanding its inner workings to setting up secure servers that run on the system. This book is designed for a wide range of readers.

It does not require you to have programming experience, although having some experience using a general-purpose computer, such as a Windows, Macintosh, UNIX, or other Linux system, is certainly helpful. This book is appropriate for Students who are taking a class in which they use Linux Home users who want to set up and/or run Linux Professionals who use Linux at work System administrators who need an understanding of Linux and the tools that are available to them including the bash and Perl scripting languages Computer science students who are studying the Linux operating system Technical executives who want to get a grounding in Linux A Practical Guide to Fedora and Red Hat Enterprise Linux , Fifth Edition, gives you a broad understanding of many facets of Linux, from installing Fedora/RHEL through using and customizing it. No matter what your background, this book delivers the knowledge you need to get on with your work.

You will come away from this book understanding how to use Linux, and this book will remain a valuable reference for years to come..
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