Definition of syntax and why proper syntax is important
In the computer world, the syntax of a command refers to the rules in which the command must be run for a piece of software to understand it.
For example, a command’s syntax may dictate case sensitivity and what kinds of options are available that make the command operate in different ways.
Without proper syntax, the words and other characters that make up the command aren’t strung together in a sequence that makes sense. What results from bad syntax is the inability of the syntax reader to understand what’s trying to be conveyed.
Syntax Is Like a Language
To better understand computer syntax, think of it like English, German, Spanish, or any other language.
Language syntax requires that certain words and punctuation be used in the right way so that someone hearing or reading the words can understand them correctly. For example, if the words and characters in this sentence were placed incorrectly in a strange order, it’d be very difficult to understand.
Much like with language, the structure or syntax of a computer command must be coded or executed perfectly for it to be understood, with all the words, symbols, and other characters positioned just the right way.
Why Is Syntax Important?
Would you expect someone who reads and speaks only Russian to understand Japanese? Or what about someone who only understands English, to be able to read words written in Italian?
Similarly, different programs (much like different languages) require different rules to be followed so that the software (or person with spoken language) can interpret your requests.
For example, you wouldn’t say, “I down ran the hill large.” because that hardly makes any sense given the rules English speakers have come to understand when it comes to comprehending words. The same is true for command syntax because the program reading the syntax only understands it when it’s set up in a specific way, as you’ll see below.
Human language is somewhat forgiving, depending on the mistake. It’s far more important, however, not to overlook syntax when working with computer commands because even a tiny, seemingly acceptable error in syntax will mean that a computer can’t understand what it is you’re after.
Let’s look at the ping command as an example of the proper and improper syntax. The most common way that the ping command is used is by executing ping, followed by an IP address, like this:
ping 192.168.1.1This syntax is 100 percent correct, and because it’s correct, the command-line interpreter, probably Command Prompt in Windows, can understand that we want to check if the computer can communicate with that specific device on the network.
However, the command will not work if I rearrange the text and put the IP address first and then the word ping like this:
192.168.1.1 pingWe’re not using the right syntax, so although the command looks a bit like it should, it will not work because the computer has no idea how to handle it.
Computer commands with the wrong syntax are often said to have a syntax error, and will not run as intended until the syntax is corrected.
Although it’s certainly possible with simpler commands (as you saw with ping), you’re much more likely to run into a syntax error as computer commands become more complex.
Syntax errors aren’t just limited to commands like those mentioned but also to any other programming language like HTML or JavaScript. Just consider how many potential syntax mistakes could be made when coding something like a whole operating system, which might have millions of lines of code!
You can see in just this one example with ping that it’s very important to be able to not only read syntax correctly but to, of course, be able to apply it perfectly.
