Download Shell Scripting Recipes: A Problem-Solution Approach by Chris Johnson PDF

By Chris Johnson

Shell Scripting Recipes is full of over a hundred and fifty much-needed and functional recipes that stick to a problem-solution structure, and support all Unix clients regain a number of the misplaced time spent growing and checking out shell scripts. so much scripts during this booklet are POSIX (Portable working method Interface)-compliant, in order that they are supported by means of a few of the significant shell variations, together with Bash, ksh, and sh, between others. This thoroughly up-to-date moment version takes under consideration the various alterations to shell scripting that experience happened due to the fact that its unique e-book approximately ten years in the past, and the entire recipes are actually appropriate for a contemporary audience.

Each real-world instance recipe follows a similar constitution and simply exhibits you what's occurring in every one case. dossier conversion (DOS, UNIX, and Mac), process management, and source tracking are only the various issues coated during this hugely sensible shell scripting reference. additionally, you will locate recipes for filename administration, advanced date calculations, reveal keep an eye on features, and more.

Author Chris Johnson's code is apparent, direct, and acceptable, and he explains every thing good in every one recipe so you comprehend not only the way to do whatever, yet why to do it that means. Shell Scripting Recipes is a useful e-book and one so as to add on your library this day.

Show description

Read Online or Download Shell Scripting Recipes: A Problem-Solution Approach PDF

Similar programming books

How to Do Everything with HTML

One other unlock in our well known the right way to Do every little thing sequence, this pleasant, solutions-oriented e-book is stuffed with step by step examples for writing HTML code. every one bankruptcy starts off with the categorical how-to issues that may be coated. in the chapters, each one subject is observed through a superior, easy-to-follow walkthrough of the method.

ZooKeeper: Distributed process coordination

Building dispensed functions is tough sufficient with no need to coordinate the activities that lead them to paintings. This sensible consultant indicates how Apache ZooKeeper is helping you deal with disbursed structures, so that you can concentration in general on software good judgment. despite ZooKeeper, imposing coordination projects isn't really trivial, yet this publication offers solid practices to provide you a head begin, and issues out caveats that builders and directors alike have to stay up for alongside the way.

In 3 separate sections, ZooKeeper participants Flavio Junqueira and Benjamin Reed introduce the foundations of disbursed platforms, offer ZooKeeper programming strategies, and contain the data you want to administer this service.
• find out how ZooKeeper solves universal coordination initiatives
• discover the ZooKeeper API’s Java and C implementations and the way they range
• Use ways to song and react to ZooKeeper nation alterations
• deal with disasters of the community, program procedures, and ZooKeeper itself
• know about ZooKeeper’s trickier points facing concurrency, ordering, and configuration
• Use the Curator high-level interface for connection administration
• get to grips with ZooKeeper internals and management instruments

iOS 9 Programming Fundamentals with Swift: Swift, Xcode, and Cocoa Basics

Flow into iOS improvement by means of getting an organization take hold of of its basics, together with the Xcode IDE, the Cocoa contact framework, and rapid 2. 0—the newest model of Apple's acclaimed programming language. With this completely up to date advisor, you'll research Swift’s object-oriented suggestions, know how to exploit Apple's improvement instruments, and observe how Cocoa offers the underlying performance iOS apps must have.

Microsoft Windows 2000 and IIS 5.0 administrator's pocket consultant

This publication is great when you are working a server with home windows 2000 and IIS. for those who run into difficulties or have questions whilst surroundings issues up or keeping them it's a speedy reference for solutions.

Additional info for Shell Scripting Recipes: A Problem-Solution Approach

Example text

Under normal circumstances, one wouldn’t think of writing a shell function for floating-point multiplication; awk would be a better choice for that. I (Chris) wrote _fpmul as a personal challenge, just to show that it could be done. Now that it’s done, and it has proved to be faster than other methods, I do use it in scripts. math-funcs Other operations on decimal fractions are more complicated, and therefore aren’t worth writing unless there’s a specific need to do so. Command Substitution Is Slow When I discovered that using command substitution to store the results of a function in a variable was so slow (in all shells except ksh93) that it severely reduced the advantage of using functions, I started looking for ways to mitigate the phenomenon.

Menu=" 1. Yes 2. " $ menu1 "echo YES" "echo NO" 1. Yes 2. No ? 3 bash: Invalid entry: 3 1. Yes 2. No ? 2 NO 1. Yes 2. No ? 1 YES 1. Yes 2. No ? $NL 1. Yes 2. " $ menu1 "date" ":" Do you want to see today's date? 1. Yes 2. No ? y bash: Invalid entry: y Do you want to see today's date? 1. Yes 2. No ? Mon Feb 7 08:55:26 EST 2005 For more elaborate menus using this function, see the conversion script in Chapter 5. 5 arg—Prompt for Required Argument If None Supplied You may have a number of scripts that take an argument.

The portable way uses stty to turn off the terminal’s buffering, and to set the minimum number of characters required for a complete read. A single character can then be read by dd. Usage get_key [VAR] If a variable is specified, the key will be read into that variable. If not, it will be in $_KEY. The Script get_key() { [ -t 0 ] && { ## Check whether input is coming from a terminal [ -z "$_STTY" ] && { _STTY=$(stty -g) ## Store the current settings for later restoration } ## By default, the minimum number of keys that needs to be entered is 1 ## This can be changed by setting the dd_min variable ## If the TMOUT variable is set greater than 0, the time-out is set to ## $TMOUT seconds if [ ${TMOUT:--1} -ge 0 ] then _TMOUT=$TMOUT stty -echo -icanon time $(( $_TMOUT * 10 )) min ${dd_min:-1} else stty -echo -icanon min ${dd_min:-1} fi } ## Read a key from the keyboard, using dd with a block size (bs) of 1.

Download PDF sample

Rated 4.24 of 5 – based on 17 votes