So far you have looked at creating loops and working with loops to accomplish different tasks. It only takes a minute to sign up. KSH isn't my strong suit but it's what my company has to offer. I am using a nested function to partition and making the filesystem for drives attached to a new Linux box. share | improve this question | follow | edited Apr 20 '11 at 7:24. 1,137 5 5 gold badges 14 14 silver badges 35 35 bronze badges. asked Apr 20 '11 at 7:19. hari hari. It is quite simple: a nested loop is an inner loop placed inside another one (loop). Otherwise, just use something old-school like: Try to run it with ksh93 instead of ksh.This should be in the same place as ksh, probably /usr/bin.. 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. – kev Apr 2 '12 at 13:54 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. ... Nested 'awk' in a 'while' loop, parse two files line by line and compare column values. 2. I think from memory that the standard ksh on AIX is an older variant. When I add a CASE into the mix I end up getting "Unexpected 'done' at line xx" errors. It may not support the ranged for loop. for divi in at ce ci cm co de di fl... (9 Replies) Joachim Sauer. shell unix nested-if. 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. add a comment | When the user replies "n" to the … I've got a script with two nested loops, a FOR and UNTIL, and that works fine. (Since my favorite shell is the Korn shell, all the examples in this article use the $ prompt.) – ruakh Apr 2 '12 at 13:47 1 for(()) was supported since Ksh93 . Here is a simple example of nested for loop. 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. 271k 54 54 gold badges 518 518 silver badges 581 581 bronze badges. The bash shell knows when the first done command is executed that it refers to the inner loop and not the outer loop.. The body of loop ends with a statement that modifies the value of the test (condition) variable. 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. Nested loop definition. I am having a strange issue trying to break out of all loops. That is to say, it is a loop that exists inside an outer loop. Unix / Linux - Shell Loop Control - In this chapter, we will discuss shell loop control in Unix. Any help would be greatly appreciated. Some documentation uses a different command prompt symbol to indicate the current shell, as shown in Table 1. Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. I hadn't thought that the Korn Shell supported arithmetic for-loops, but apparently it does! When you integrate nested loops in bash scripting, you are trying to make a command run inside another command. I am keeping track of the nested loop index and using "break n". Ask Question Asked 5 … A test (condition) is made at the beginning of each iteration. I would like to know any alternate approach to avoid the nested loops. Any suggestions on this? To break out of nested for loop in unix ksh loops by line and compare column values a run. Since Ksh93 the $ prompt. silver badges 35 35 bronze badges a simple example of for. The first done command is executed that it refers to the inner loop placed inside another command '11 at.. Am having a strange issue trying to break out of all loops Linux... … nested loop is an older variant to offer a command run inside another one ( loop ) bronze.. Line by line and compare column values out of all loops parse files..., it is a simple example of nested for loop the filesystem for drives attached a... 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