Linux Shell Script Variable Assignment

And some things about the bash programming languages are quite different from other programming languages I use!I really thought I knew this stuff already but I learned a couple things by writing this post so maybe you will too.

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User variables are case sensitive, so the variable Var1 is different from the variable var1.

This little rule often gets novice script programmers in trouble.

Some of the system defined variables are given below :system variable within the double quotation marks in the first string, and the shell script was still able to figure out what we meant. Look at what happens in this example: That’s better.

The backslash allowed the shell script to interpret the dollar sign as an actual dollar sign, and not a variable. A shell script allows us to set and use our own variables within the script.

Every process on Linux actually has environment variables (you can run They behave like global variables in any other programming language.

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There are also local variables, which are scoped to only exist inside a bash function. prints the numbers from 1 to 10 (one per line), and this for loop is just taking that output and iterating over it. You can interpolate command output with either backticks or There are cases where it’s okay to just use $X instead of “$X”, but can you really keep track of when it’s okay and when it’s not okay? Always quote your bash variables and you’ll be happier.

Values are assigned to user variables using an equal sign.

No spaces can appear between the variable, the equal sign, and the value (another trouble spot for novices).

And unlike formal programming languages, a shell script doesn’t require you to declare a type for your variables In this article we will discuss variables, its types and how to set & use variables in shell scripting.

These are the variables which are created and maintained by Operating System(Linux) itself.


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