Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. I would like to know any alternate approach to avoid the nested loops. Relevant commands, code, scripts, algorithms: Command to run the script: Create_Index.ksh "ABC" 1 Indexfields_1 will contain the values separated by "," for which the mapping needs to be created. It may not support the ranged for loop. add a comment | 2. I think from memory that the standard ksh on AIX is an older variant. Nested loop definition. ... Nested 'awk' in a 'while' loop, parse two files line by line and compare column values. share | improve this question | follow | edited Apr 20 '11 at 7:24. Any suggestions on this? I am having a strange issue trying to break out of all loops. – kev Apr 2 '12 at 13:54 Ask Question Asked 5 … Some documentation uses a different command prompt symbol to indicate the current shell, as shown in Table 1. When I add a CASE into the mix I end up getting "Unexpected 'done' at line xx" errors. asked Apr 20 '11 at 7:19. hari hari. That is to say, it is a loop that exists inside an outer loop. The bash shell knows when the first done command is executed that it refers to the inner loop and not the outer loop.. Overview of Unix Shell Loops and Different Loop Types like: Unix Do While Loop; Unix For Loop; Unix Until Loop; In this tutorial, we will cover the control instructions that are used to iterate a set of commands over a series of data. I am keeping track of the nested loop index and using "break n". (Since my favorite shell is the Korn shell, all the examples in this article use the $ prompt.) for divi in at ce ci cm co de di fl... (9 Replies) When the user replies "n" to the … It is quite simple: a nested loop is an inner loop placed inside another one (loop). 271k 54 54 gold badges 518 518 silver badges 581 581 bronze badges. shell unix nested-if. – ruakh Apr 2 '12 at 13:47 1 for(()) was supported since Ksh93 . When you integrate nested loops in bash scripting, you are trying to make a command run inside another command. 1,137 5 5 gold badges 14 14 silver badges 35 35 bronze badges. Otherwise, just use something old-school like: The body of loop ends with a statement that modifies the value of the test (condition) variable. Try to run it with ksh93 instead of ksh.This should be in the same place as ksh, probably /usr/bin.. So far you have looked at creating loops and working with loops to accomplish different tasks. I hadn't thought that the Korn Shell supported arithmetic for-loops, but apparently it does! Any help would be greatly appreciated. Here is a simple example of nested for loop. Since you cannot ensure that your scripts will always be executed using the Korn shell, put #!/bin/ksh as the first line in each script. A test (condition) is made at the beginning of each iteration. Unix / Linux - Shell Loop Control - In this chapter, we will discuss shell loop control in Unix. KSH isn't my strong suit but it's what my company has to offer. The nested loop (also called the inner loop) iterates through its values for each iteration of the outer loop.Notice that there’s no difference between the do and done commands for the two loops. I've got a script with two nested loops, a FOR and UNTIL, and that works fine. The for loop; The while loop; Each and every loop must: First, the variable used in loop condition must be initialized, then execution of the loop begins. Joachim Sauer. It only takes a minute to sign up. I am using a nested function to partition and making the filesystem for drives attached to a new Linux box. 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