Bash quick start guide : get up and running with Shell scripting with Bash.

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Bash and shell script programming is central to using Linux, but it has many peculiar properties that are hard to understand and unfamiliar to many programmers, with a lot of misleading and even risky information online. Bash Quick Start tackles these problems head on, and shows you the best practic...

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Detalles Bibliográficos
Clasificación:Libro Electrónico
Autor principal: Ryder, Tom
Formato: Electrónico eBook
Idioma:Inglés
Publicado: Birmingham : Packt Publishing Ltd, 2018.
Temas:
Linux.
UNIX Shells.
Linux
UNIX Shells
Computer networking & communications.
Computer architecture & logic design.
COMPUTERS > Operating Systems > Linux.
COMPUTERS > Operating Systems > UNIX.
Acceso en línea:Texto completo
Tabla de Contenidos:
  • Cover
  • Title Page
  • Copyright and Credits
  • Dedication
  • Packt Upsell
  • Contributors
  • Table of Contents
  • Preface
  • Chapter 1: What is Bash?
  • What Bash is and is not
  • Getting Bash
  • Checking Bash is running
  • Switching the login shell to Bash
  • Identifying the Bash version number
  • Upgrading Bash on macOS X
  • Understanding Bash features
  • POSIX shell script features
  • Bash-specific features
  • Do I need Bash?
  • Choosing when to apply Bash
  • Choosing when to avoid Bash
  • Getting help with Bash
  • Summary
  • Chapter 2: Bash Command Structure
  • Using Bash interactively
  • Interactive key bindings
  • Simple commands
  • Shell metacharacters
  • Quoting
  • Escaping
  • Single quotes
  • Double quotes
  • Quote concatenation
  • Running commands in sequence
  • Exit values
  • Stopping a command list on error
  • Running a command in the background
  • Summary
  • Chapter 3: Essential Commands
  • Distinguishing command types
  • Essential Bash builtin commands
  • The type command
  • The echo command
  • The printf command
  • The pwd command
  • Tilde paths
  • The cd command
  • Changing the directory in scripts
  • The set command
  • The declare command
  • The test, [, and [[commands
  • Essential system commands
  • The ls command
  • Getting filename lists without ls
  • The mv command
  • The cp command
  • The rm and rmdir commands
  • The grep command
  • The cut command
  • The wc command
  • Getting file sizes with wc or du
  • The find command
  • Executing commands for each result
  • A note about find and xargs
  • The sort and uniq commands
  • Summary
  • Chapter 4: Input, Output, and Redirection
  • Redirecting output
  • Redirection paths
  • Avoiding overwrites
  • Appending to files
  • Understanding created file permissions
  • Choosing permissions for created files
  • Redirecting errors
  • Combining errors with output.
  • Blocking errors completely
  • Sending output to more than one place
  • Redirecting input
  • Using a long string as input with here-documents
  • Using pipes
  • Adding file contents to a stream
  • Piping output from multiple programs
  • Filtering programs
  • The sed stream editor
  • The AWK programming language
  • Summary
  • Chapter 5: Variables and Patterns
  • Using variables
  • Listing variables
  • Naming variables
  • Variable name case
  • Clearing variables
  • Environment variables
  • Calling programs with environment variables
  • Expanding variables
  • Reading a value into a variable
  • Getting command output in variables
  • Parameter expansion forms
  • Specifying default values
  • String chopping
  • Extracting substrings
  • Getting string length
  • Substituting strings
  • Changing case
  • Combining parameter expansion forms
  • Doing math in Bash
  • Fixed or floating-point arithmetic
  • Using globs
  • Configuring globbing behavior
  • Including dot files, but excluding dot and dot-dot
  • Expanding to nothing
  • Case-insensitive globbing
  • Extended globbing
  • Using arrays
  • Glob expansion in arrays
  • Associative arrays
  • Summary
  • Chapter 6: Loops and Conditionals
  • Using the if keyword
  • Using the test command
  • Using the [command
  • Using the [[keyword
  • Arithmetic conditions
  • Switching with the case keyword
  • Looping over shell words with for
  • Skipping an iteration
  • Ending the loop
  • Misuse of for loops
  • Using Bash's C-style for loops
  • Using while loops
  • Infinite loops
  • Reading data line by line
  • Field splitting
  • Saving fields into arrays
  • Choosing the splitting character
  • Disabling whitespace trimming
  • Reading process output
  • Avoiding subshell problems
  • Avoiding input problems with ssh
  • Summary
  • Chapter 7: Scripts, Functions, and Aliases
  • Aliases
  • Defining new aliases.
  • Understanding shortcomings with aliases
  • Functions
  • Defining functions
  • Passing arguments to functions
  • Using
  • to separate options from filenames
  • Getting all the arguments
  • Returning values from functions
  • Understanding function input and output
  • Function scope
  • Reloading functions at shell startup
  • Scripts
  • Scripting methods
  • Writing a shebang script
  • Finding scripts with PATH
  • System bindir
  • User bindir
  • Arguments to scripts
  • Understanding sh vs bash
  • Using env
  • Choosing between functions and scripts
  • Using functions in scripts
  • Summary
  • Chapter 8: Best Practices
  • Quoting correctly
  • When you don't want quotes
  • Handling filenames starting with dashes
  • Separating output and diagnostics
  • Keeping scripts brief and simple
  • Keeping scripts flexible
  • Respecting and applying the user's configuration
  • Allowing scripts to run without user input
  • Limiting the scope of shell state changes
  • Avoiding path anti-patterns
  • Avoiding Bash for untrusted user input
  • Documenting scripts
  • Writing comments
  • Providing help output
  • Writing manual pages
  • Using temporary files cleanly
  • Cleaning up after a script
  • Tools to check shell scripts for problems
  • Summary
  • Other Books You May Enjoy
  • Index.

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