New PDF release: Advanced bash-scripting guide

By Mendel Cooper

This is often the whole reference at the Borne back shell (bash). quantity 1Volume 2 includes all appendices.

Show description

Read Online or Download Advanced bash-scripting guide PDF

Best programming books

Read e-book online Perl & LWP PDF

With the LWP (Library for WWW in Perl) suite of modules, your courses can obtain and extract info from the internet. Written via a contributor to LWP, and with a foreword via one in every of LWP's creators, Perl & LWP is the authoritative advisor to utilizing this strong and well known toolkit. You'll how to navigate the net with LWP, fetching websites, filing types, coping with cookies, and gaining access to authenticated sites.

Becoming Agile: ...in an imperfect world by Greg Smith, Ahmed Sidky PDF

Many books speak about Agile from a theoretical or educational standpoint. turning into Agile takes a unique procedure and specializes in explaining Agile from a case-study viewpoint. Agile ideas are mentioned, defined, after which established within the context of a case learn that flows during the ebook.

Garrett Grolemund's Hands-On Programming with R: Write Your Own Functions and PDF

PDF e-book ISBN: 9781449359119

how to software by way of diving into the R language, after which use your newfound talents to resolve functional facts technology difficulties. With this publication, you'll find out how to load facts, gather and disassemble info items, navigate R's atmosphere approach, write your individual services, and use all of R's programming tools.

RStudio grasp teacher Garrett Grolemund not just teaches you ways to software, but additionally exhibits you ways to get extra from R than simply visualizing and modeling info. You'll achieve invaluable programming talents and aid your paintings as a knowledge scientist on the related time.
paintings hands-on with 3 sensible information research tasks in accordance with on line casino video games
shop, retrieve, and alter facts values on your computer's reminiscence
Write courses and simulations that outperform these written by way of normal R clients
Use R programming instruments resembling if else statements, for loops, and S3 periods
how to write lightning-fast vectorized R code
reap the benefits of R's package deal procedure and debugging instruments
perform and follow R programming techniques as you research them

Modern industrial automation software design: principles and by Lingfeng Wang, Kay CHen Tan PDF

* the most matters during this publication relate to software program improvement utilizing state of the art applied sciences for real-world commercial automation functions * A hands-on method of using a large choice of rising applied sciences to trendy business perform difficulties * Explains key options via transparent examples, starting from basic to extra complicated challenge domain names, and all in keeping with real-world business difficulties * an invaluable reference booklet for working towards engineers in addition to an up-to-date source ebook for researchers

Extra info for Advanced bash-scripting guide

Example text

4 fi # $unassigned is NULL. Using a variable before assigning a value to it may cause problems. It is nevertheless possible to perform arithmetic operations on an uninitialized variable. 1 2 3 4 5 6 7 8 9 echo "$uninitialized" let "uninitialized += 5" echo "$uninitialized" # # #+ # #+ # (blank line) # Add 5 to it. # 5 Conclusion: An uninitialized variable has no value, however it acts as if it were 0 in an arithmetic operation. This is undocumented (and probably non-portable) behavior, and should not be used in a script.

Prefix for an operator. Prefix for a default parameter in parameter substitution. " fi param2=${param1:-$DEFAULTVAL} # ^ -The double-dash -- prefixes long (verbatim) options to commands. sort --ignore-leading-blanks Used with a Bash builtin, it means the end of options to that particular command. This provides a handy means of removing files whose names begin with a dash. bash$ ls -l -rw-r--r-- 1 bozo bozo 0 Nov 25 12:29 -badname bash$ rm -- -badname bash$ ls -l total 0 The double-dash is also used in conjunction with set.

Home Up Next Introduction to Variables and Parameters Advanced Bash-Scripting Guide: An in-depth exploration of the art of shell scripting Next Chapter 4. Introduction to Variables and Parameters Variables are how programming and scripting languages represent data. A variable is nothing more than a label, a name assigned to a location or set of locations in computer memory holding an item of data. Variables appear in arithmetic operations and manipulation of quantities, and in string parsing. 1.

Download PDF sample

Advanced bash-scripting guide by Mendel Cooper


by Brian
4.1

Rated 4.14 of 5 – based on 39 votes