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If you ask your own question - our Certified Experts will team up with you to help you get the answers you need. Bash provides a lot of useful programming functionalities. We can use for loop for iterative jobs. Linux system administrators generally use for loop to iterate over files and folder.
In this tutorial, we will look at how to use for loop to iterate over files and directories in Linux. This mechanism is named as for each some programming languages where a list is iterated over. Bash provides different usages and syntax for the for loop but in general following syntax is used. One of the most used Numeric syntax. We will provide numbers as a list and iterate over given list.
Every number in the list will be iterated inside the for loop one by one. In numeric syntax, it is very similar to the general syntax where we provide a collection of numbers. Show 4 more comments. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog.
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Stack Overflow works best with JavaScript enabled. Accept all cookies Customize settings. Legal Notices Online Privacy Policy. Looping over a list steps through elements contained in any of these entities: A variable A value that is returned from an expression An array A file Looping over a file does not open the entire file in memory.
See also. ColdFusion 8: Added the characters, file, and array attributes. The array object. The current value of the array. Use the attribute index as shown below:. Output 1 : John 2 : Paul 3 : George 4 : Ringo. Looping over multi-dimensional arrays.
A multi-dimensional array is an array of arrays rather than an array of single values. To loop through a two-dimensional array, you must nest one loop inside of another.
For example,. Output John Paul George Ringo.
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