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Shell scripting recipes : a problem-solution approach /
Filled with over 150 essential, practical recipes that empower Unix users to regain lost time spent creating and testing shell scripts. The majority of scripts included are POSIX-compliant and supported by many of the major shell variants, including Bash, ksh, and sh. Each real-world example recipe...
| Clasificación: | Libro Electrónico |
|---|---|
| Autores principales: | , |
| Formato: | Electrónico eBook |
| Idioma: | Inglés |
| Publicado: |
[Berkeley, CA] :
Apress,
[2015]
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| Edición: | Second edition. |
| Colección: | Expert's voice in open source.
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| Temas: | |
| Acceso en línea: | Texto completo (Requiere registro previo con correo institucional) |
Tabla de Contenidos:
- At a Glance; Contents; About the Authors; Acknowledgments; Chapter 1: The POSIX Shell and Command-Line Utilities; Shell Commands; echo ; printf ; set ; shift ; type ; getopts ; case ; eval ; local ; Parameters and Variables; Positional Parameters ; Special Parameters ; Shell Variables; standard-vars-A Collection of Useful Variables; Patterns; Pathname Expansion ; Regular Expressions ; Parameter Expansion; The Bourne Shell Expansions ; {var:-DEFAULT}; {var:=DEFAULT}; {var:+VALUE}; {var:?MESSAGE}; POSIX Parameter Expansions.
- {#var}-Length of Variable's Contents{var%PATTERN}-Remove the Shortest Match from the End; {var%%PATTERN}-Remove the Longest Match from the End; {var#PATTERN}-Remove the Shortest Match from the Beginning; {var##PATTERN}-Remove the Longest Match from the Beginning; Combining Expansions; Shell-Specific Expansions, bash2, and ksh93 ; {var//PATTERN/STRING}-Replace All Instances of PATTERN with STRING; {var:OFFSET:LENGTH}-Return a Substring of var; Shell Arithmetic ; Aliases ; Sourcing a File ; Functions; Functions Are Fast ; Command Substitution Is Slow.
- Using the Functions in This Book standard-funcs: A Collection of Useful Commands; 1.1 get_key-Get a Single Keystroke from the User ; How It Works; Usage; The Script; Notes; 1.2 getline-Prompt User to Enter a Line ; How It Works; Usage; The Script; 1.3 press_any_key-Prompt for a Single Keypress ; How It Works; Usage; The Script; 1.4 menu1-Print a Menu and Execute a Selected Command ; How It Works; Usage; The Script; 1.5 arg-Prompt for Required Argument If None Supplied ; How It Works; Usage; The Script; 1.6 die-Print Error Message and Exit with Error Status ; How It Works; Usage.
- The Script 1.7 show_date-Display Date in D[D] MMM YYYY Format ; How It Works; Usage; The Script; 1.8 date_vars-Set Date and Time Variables ; How It Works; Usage; The Script; 1.9 is_num-Is This a Positive Integer? ; How It Works; Usage; The Script; Notes; 1.10 abbrev_num-Abbreviate Large Numbers ; How It Works; Usage; The Script; Notes; 1.11 commas-Add Thousands Separators to a Number ; How It Works; Usage; The Script; 1.12 pr1-Print Arguments, One to a Line ; How It Works; Usage; The Script; 1.13 checkdirs-Check for Directories; Create If Necessary ; How It Works; Usage; The Script.
- 1.14 checkfiles -Check That a Directory Contains Certain FilesHow It Works; Usage; The Script; 1.15 zpad-Pad a Number with Leading Zeroes ; How It Works; Usage; The Script; 1.16 cleanup-Remove Temporary Files and Reset Terminal on Exit ; How It Works; Usage; The Script; The Unix Utilities; cat: Concatenate Files to the Standard Output ; sed: A Text Stream Editor ; awk: Pattern Scanning and Processing Language ; grep: Print Lines Matching a Regular Expression ; date: Show or Set the System Date ; tr: A Character Translation Utility ; wc: Count Characters, Words, and Lines in a File.