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Line 8 changes the value of the global var2 variable.The local var1 shadows the global var1 value due to dynamic scoping. Line 7 declares a new local variable with the same name as the global variable var1.Since the variable scope is global, the original values print out. Lines 5-6 are inside the function's body and print the variables to the console.Lines 1-2 declare variables var1 and var2 and set them both to 1.

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Add the following code to the script: var1=1 Create a script called variable.sh: vim variable.shĢ. Try the following bash script to demonstrate how function variables work in bash:ġ. In dynamic scoping, a local variable shadows a global variable when the two carry the same name. Variables defined inside a function are also global. Adding the keyword local makes the term accessible only within the function and the child functions/processes. The variables in bash are global by default and accessible from anywhere, including function bodies. However, if the code is in the ~/.bashrc file, everything is restored to normal in the next session. The function is no longer available in the current terminal session.

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If you need to free up a namespace occupied by a function in the current terminal session, run: unset Note: Learn everything you need to know about using the Bash declare statement. The declare built-in in debugging mode allows viewing the function's contents and location without running the code. To see the function's contents, run: declare -f The output prints the function's name, the line number, and the file location where the function definition is.ģ. Check the function's source file with: declare -F Run the bash shell in debugger mode: bash -debuggerĢ. To see where a bash function is defined and its contents, enter the following commands in the terminal:ġ. To save for future sessions, add the code to the ~/.bashrc file. The function only stays defined in the current terminal session. The output runs the commands in the function's body. Execute the function by entering the function's name in the terminal: my_function There are two different ways to declare a bash function:Īlternatively, the same function can be one line: () Ģ. To use bash functions, follow the outlines below. Alongside other bash alias commands and directly in the terminal as a command.Inside a shell script, where the function definition must be before any calls on the function.There are two ways to implement Bash functions: The chunks are easier to develop and maintain. Functions help organize long shell scripts into modular and reusable code blocks. Since computer memory is not an issue nowadays, using functions is faster than repeating code.Ģ. A function is read directly into the shell's memory and stored for later use. Using functions in bash scripting comes with two benefits:ġ. The bash function is like a script within a script. What Are Bash Functions?Ī bash function is a technique for grouping reusable bits of code under one name for later use. If your default shell is different, try adding the #!/bin/bash shebang to the beginning of the scripts. Note: The Bash ( Bourne Again SHell) is considered the default shell in this tutorial.