Using Makefiles to Compile Your Application
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November 5, at am. October 8, at pm. TJ says:. July 10, at am. Richard says:. September 1, at am. You will notice that this time, some of the names that the computer returns to you will have a slash after them. These names are folders: the rest are files. You can always cd into a folder by running cd with the folder name as an argument, as long as you can see that folder with ls -F.
When you're done looking in folders, it's time to go back up. But how?
Getting to Know the Command Line
Luckily, every folder contains a hidden link back up. To see these hidden links, we will use the -a flag for ls to see all. There are at least two hidden links in every folder. In fact, you can give the ls command multiple flags, like so:. If you run this command, you will notice that the.
To go back up a folder, you can always run:. Remember that if you ever get lost in the computer, you can run pwd to see where you are.
Computer programmers are lazy. Because they are lazy, they invented some techniques to do more with less work.
Here are some of those techniques:. Whenever you need to type out a location in an argument for example, in the cd command , you don't have to type out the whole thing: the first few letters will do.
Once you've typed three or four letters, press the tab key, and the command line will fill in the rest for you! For example, if you are in your home directory, and you type cd Desk and then press the tab key, the command line will automatically complete the command to read cd Desktop! You can also use this if you find yourself mistyping folder names: tab autocompletion will always fill it in correctly.
The command line has a few shortcuts built in. For example, to see your previously typed command, just press the up button. You can do this to submit the same command multiple times, or to edit a command that you didn't type in quite right. Remember, when you use the command line, the computer will cheerfully do anything it can for you. If you ask it to do something bad, it will try to do so. Some people take advantage of this fact by telling novice command line users to run commands that do nasty things to your computer.
Here are a few to watch out for. Never run any of these commands! They can and will destroy your computer! The command to remove a file is rm.
Advanced iOS Summer Bundle
You can also use rm to remove multiple files at a time. This command tells the computer to start at the top of the file structure, and delete every single file on the computer without stopping. After this command has run, your computer be empty. If you turn it off, it will not be able to turn back on until you reinstall an operating system on it.
This interesting-looking piece of code is called a fork bomb. Like a virus, it will continually multiply and subdivide itself, asking for more and more resources from the computer, until the entire computer is trying to process this code. As a result, the computer has no resources left for any other programs or processes, and will freeze or crash. Fortunately, rebooting your computer should cure it.
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