Syntax Of For Loop In Linux

10 Practical Bash quotforquot Loop Examples. The for loop in Bash is a fundamental control structure used for iterating over a list of items. It allows you to execute a sequence of commands repeatedly for each item in the list. It can be used to create patterns, create mathematical sequences, managing files etc.

Bash for loop syntax and usage page from the Linux shell scripting wiki Also read the following manual pages using man commandinfo command or help command man bash info bash help for help help break help continue Was this helpful? Please add a comment to show your appreciation or feedback.

Use the 'Continue' statement with Bash For Loop. The 'continue' statement is a built-in command that controls how a script runs. Apart from bash scripting, it is also used in programming languages such as Python and Java. The continue statement halts the current iteration inside a loop when a specific condition is met, and then resumes

Portability For loop syntax works consistently across most Unix-like systems, making your Bash scripts portable. Now let's look at some examples to see how for loops are used in practice. 1. Iterating Through a List of Static Values. One simple application of for loops is to iterate through a predefined list of static values.

1 The for loop syntax 2 More about the for loop. 2.1 Example 2.2 The For Loop Using Strings 2.3 The For Loop Using Variable's Contents 2.4 The For Loop Using Command-line Arguments 2.5 The for loop using command substitution 2.6 The for loop using ranges or counting 3 Further readings

The syntax of a for loop from the bash manual page is. for name in word do list done The semicolons may be replaced with carriage returns, as noted elsewhere in the bash manual page quotA sequence of one or more newlines may appear in a list instead of a semicolon to delimit commands.quot. However, the reverse is not true you cannot arbitrarily replace newlines with semicolons.

In this article, we are going to focus on the for loop in BASH scripts. Depending on the use case and the problem it is trying to automate, there are a couple of ways to use loops. Simple For loop Range-based for loop Array iteration for loops C-Styled for loops Infinite for loop Simple For loop. To execute a for loop we can write the

Conclusion. The for loop is a fundamental tool in Linux shell scripting, allowing for the automation of repetitive tasks. Whether you are iterating over files, numbers, or command outputs, the flexibility of for loops makes them essential for efficient scripting. Mastering for loops will significantly enhance your ability to process and manipulate data in the Linux environment.

I commonly like to use a slight variant on the standard for loop. I often use this to run a command on a series of remote hosts. I take advantage of Bash's brace expansion to create for loops that allow me to create non-numerical for loops. Example I want to run the uptime command on frontend hosts 1-5 and backend hosts 1-3