Download Command Line Kung Fu: Bash Scripting Tricks, Linux Shell by Jason Cannon PDF

By Jason Cannon

Develop into a Linux Ninja with Command Line Kung Fu! Do you're thinking that you should lock your self in a basement studying cryptic guy pages for months on result in order to have ninja like command line abilities? in fact, should you had an individual percentage their strongest command line guidance, methods, and styles you'd retailer your self loads of time and frustration. What for those who may glance over the shoulder of an exceptional pal that simply occurred to be a command line guru? What in the event that they not just confirmed you the instructions they have been utilizing, yet why they have been utilizing them and precisely how they labored? And what if that good friend took the time to put in writing it all down so that you can confer with it everytime you loved? good, a chum did simply that. Command Line Kung Fu is filled with dozens of suggestions and over a hundred useful real-world examples. You won't locate theoretical examples during this publication. The examples show the best way to resolve real difficulties and achieve precious ambitions. The strategies are effortless to discover, too. every one bankruptcy covers a selected subject and teams similar suggestions and examples jointly. for instance, if you want support extracting textual content from a dossier glance within the "Text Processing and Manipulation" bankruptcy. additionally, a accomplished index is incorporated. for you to locate each instance the place a given command is used -- no matter if it's now not the most topic of the end -- glance within the index. it's going to record each position within the booklet the place that command seems to be. here's just a few of what you are going to examine by means of examining Command Line Kung Fu tips to quick and simply repeat instructions on your shell historical past Shortcuts for grabbing particular phrases out of your shell heritage to exploit on your present command the way to store a replica of your command line consultation for later reference easy methods to strip out clean traces and reviews from documents how one can regulate colorized textual content while makes use of pipes and pagers how one can rework textual content: from altering case to substituting characters and extra tips on how to extract particular blocks of textual content from records or streams of enter a short tip to mend universal typos tips on how to edit records over the community easy methods to examine the diversities among documents in your neighborhood machine and a distant one easy methods to create and use SSH tunnels how one can ascertain what courses are listening on what ports the way to kill all of the approaches for a given consumer with a unmarried command options for facing multi-hop SSH connections find out how to disconnect from a server in a manner that might let you choose up the place you left off how you can automate software program installs that require person enter Shell scripting assistance easy methods to immediately maintain repeating a command till it succeeds easy methods to delete a dossier that's being written to tips to surf the net from the command line... and extra importantly find out how to obtain something from the net and have interaction with HTTP APIs how one can make sure who and what's utilizing the main disk area the right way to safe your internet browser consultation whilst utilizing an open wifi hotspot the way to generate random passwords from the command line suggestions for simply growing backups suggestions for dealing with tar files the best way to exchange a string in a number of documents instantly with only one command and lots more and plenty more... What you study in Command Line Kung Fu applies to any Linux distribution together with Ubuntu, Debian, Linux Mint, RedHat, Fedora, OpenSUSE, Slackware, and extra. Scroll up, click on the "Buy Now With 1-Click" button to get your black belt in Linux Command Line Kung Fu.

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Extra resources for Command Line Kung Fu: Bash Scripting Tricks, Linux Shell Programming Tips, and Bash One-Liners

Sample text

It doesn't matter if the superclass and subclass are in different packages, the protected superclass member is still visible to the subclass (although visible only in a very specific way as we'll see a little later). This is in contrast to the default behavior, which doesn't allow a subclass to access a superclass member unless the subclass is in the same package as the superclass. Whereas default access doesn't extend any special consideration to subclasses (you're either in the package or you're not), the protected modifier respects the parent-child relationship, even when the child class moves away (and joins a new package).

This makes the variable accessible to all other classes inside the certification package, as well as inheritable by any subclasses outside the package. println("x is " + x); // No problem; Child // inherits x } } The preceding code compiles fine. Notice, though, that the Child class is accessing the protected variable through inheritance. Remember, any time we talk about a subclass having access to a superclass member, we could be talking about the subclass inheriting the member, not simply accessing the member through a reference to an instance of the superclass (the way any other nonsubclass would access it).

A typical method declaration with multiple arguments looks like this: public Record getRecord(int fileNumber, int recordNumber) {} Method arguments are essentially the same as local variables. In the preceding example, the variables fileNumber and recordNumber will both follow all the rules applied to local variables. This means they can also have the modifier final: public Record getRecord(int fileNumber, final int recNumber) {} In this example, the variable recordNumber is declared as final, which of course means it can't be modified within the method.

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