Peter Seebach's Beginning Portable Shell Scripting: From Novice to PDF

By Peter Seebach

ISBN-10: 1430210435

ISBN-13: 9781430210436

This ebook introduces an essential new point of shell scripting to the large variety of directors and builders operating throughout Linux, OS X and Unix command line. whereas there were different shell scripting books, Peter Seebach right here addresses the fashionable factor of portability to this extensive client base. This booklet, addressing a large know-how base, is decided to develop into the fashionable shell scripting reference.

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In truth, i actually do not know the way someone can provide this e-book five stars. to begin off on a good tone, i will say what I cherished approximately it.

1) plenty of info. there isn't any denying this, it's very informitive. although, this can be a double edged swords (will speak about later)

2) the fundamental drivers are defined pretty much. The scull driving force is an effective option to ease into motive force improvement, imo. basic sufficient that it isn't too overwhelming and ununderstandable, yet no longer overly basic so you really get an idea of what is going on.

3) it really is free.

That's it for the positives. Now for a big checklist of negatives.

1) lots of the details is irrelevent. i think just like the authors misplaced concentration because the ebook went on, and forgot they weren't writing a common "Linux Kernel" booklet yet a particular ebook for drivers. Many a time do they spend pages upon pages occurring approximately whatever, in simple terms to say "but this is often by no means utilized by learn driving force builders" on the finish. you find yourself in a truly disagreeable scenario the place you want to sift via a host of lifeless information to get to the valuable stuff. as a rule i stopped up simply looking out google, and acquired higher results.

2) loss of extra advanced examples. let's accept it, not anyone must write a really easy char motive force. in spite of the fact that, that is as complicated because the examples get. past the scull driving force, it truly is simply code fragments. I in actual fact desire you do not have to jot down a serial tty gadget. Which leads me to my subsequent point.

3) outmoded. Many kernel API alterations were made to the purpose the place the code isn't any longer compilable (especially at the tty front). tools utilized in the e-book were performed away with within the more recent kernel API's.

Honestly, you are far better off simply resorting to Google. as a way to write your individual motive force and also you learn via this ebook, you will nonetheless don't know the place to begin. The features within the scull motive force are well-described, yet that is it. The authors use an excessive amount of area writing approximately dead crap you actually do not care approximately, and this comes on the cost of important info
that will truly assist you write drivers.

This ebook will most likely arise in your google searches, and it'd be worthy it to skim the general chapters. in truth notwithstanding, it isn't going to inform you something your different seek effects will not. this can be most certainly no longer the "end all, be all" of writing linux drivers, it simply occurs to be the one one.

Extra resources for Beginning Portable Shell Scripting: From Novice to Professional (Expert's Voice in Open Source)

Example text

Code that is broken identically on ten platforms is of no use to you. Established shell conventions make it easier for other people to read your code, make it easier for you to read other peoples’ code, and usually have sound engineering principles behind them. Similarly, learning to program defensively is essential to making good use of the shell. Because the shell runs with no sandbox, and with all of the caller’s privileges and access to the file system, it is extremely dangerous to run badly written shell code.

There is no way to specify repetition of a character class; no shell pattern matches an arbitrary number of digits. You can’t make part of a pattern optional; the closest you get to optional components is the asterisk. Patterns as a whole generally match as much as they can; this is called being greedy. However, if matching too many things with an asterisk prevents a match, the asterisk gives up the extra characters and lets other pattern components match them. If you match the pattern b* to the string banana, the * matches the text anana.

What is your name? Dave I'm sorry, Dave, but I can't let you do that. Note the use of double quotes to protect the spaces and other punctuation, including single quotes. " read name echo I'm sorry, $name, I can't let you do that. In this version, because the single quotes were not themselves quoted, they defined a quoted string. This has two effects: The first is to prevent $name from being expanded, and the second is the removal of the apostrophes, which the shell interprets as single quotes.

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Beginning Portable Shell Scripting: From Novice to Professional (Expert's Voice in Open Source) by Peter Seebach

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