Format:
V, 172 Seiten
ISBN:
9781789538830
Content:
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 practices of shell script programming
Content:
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
Content:
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
Additional Edition:
Erscheint auch als Online-Ausgabe ISBN 978-1-78953-408-5
Language:
English
Subjects:
Computer Science
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