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