for ( ( expr1; expr2; expr3 )) eval for i in {$start..$end}\;do echo \$i\;done. The second form of the for loop is similar to the for loop in “C” programming language, which has three expressions (initialization, condition and updation). The for loop syntax is as follows: The for loop numerical explicit list syntax: The for loop explicit file list syntax: The for loop variable's contents syntax: The for loop command substitution syntax: The for loop explicit file list using bash array syntax: The for loop three-expression syntax ( this type of for loop share a common heritage with the C programming language ): The above syntax is characterized by a three-parameter loop control expression; consisting of an initializer (EXP1), a loop-test or condition (EXP2), an… Could you please i have issue on the above script ? 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. When you don’t provide the start, condition, and increment in the bash C-style for loop, it will become infinite loop. For example, if the value of N is 7, then N divided by 1 is 7 divided by 1. done, Above example is not working…. done, @ MAine_guy thanks………. 15 examples explaining bash for loop syntax and command, with practical examples, valid for Linux and Unix like operating systems. The C shell (csh) or the improved version, tcsh is a Unix shell that was originally created by Bill Joy at University of California, Berkeley in the late 1970s. We are going to cover the if, if-else, and elif conditional statements.. The following example loops through 10 times using the values 1 through 10. 15 examples explaining bash for loop syntax and command, with practical examples, valid for Linux and Unix like operating systems. Note: Refer to our earlier article to understand more about bash positional parameters. Further, there is no limit on its scalability. Now let's learn about adding values and incrementing variables in shell scripts when working with loop. You can break out of a for loop using ‘break’ command as shown below. every time i try to work run these scripts i get “./week.sh[5]: i++: more tokens expected” this error. for loops iterate through a set of values until the list is exhausted: for.sh #!/bin/sh for i in 1 2 3 4 5 do echo "Looping ... number $i" done. In the above for loop, it will execute all the commands which are ther… In the above example we do the same execution of for loop as above example but instead of input list reading will be done using “in” keyword. Here, while and for loops are available in most of the other programming languages like C, C++ and PERL, etc. Lot of people fall into this trap. echo ” i m $i” This helps so much whom is learning this useful language. In a BASH for loop, all the statements between do and done are performed once for every item in the list. do You can loop through using range of numbers in the for loop “in” using brace expansion. Linux shell scripts can be as diverse as you can imagine. Create a bash file named ‘for_list1.sh’ and add the … We’ve got some built-in keywords in shell scripting, and while, do, and done, they’re among those. Example of an if Statement Only The comma will be treated as part of the value. sudo ln -s bash sh. only this did not worked. done. Now let's learn about adding values and incrementing variables in shell scripts when working with loop. It will not go inside the loop. Here is a simple example that uses the while loop to display the numbers zero to nine − While loops. Good one…will use most of examples in practical…. do So, for loop is used to perform a particular task like addition/multiplication or any other operation for a certain number of times until the termination condition met in any operating system. do Facebook; Part 8: Test. The for statement for command-list1 do command-list2 done Let start with one unix shell script for loop example 1 2 3 4 … In shell scripting, every variable needs to be represented in double-quotes but there are few exceptions such as if we use double quotes in $Month in above for loop line then it will treat entire words as a single line. I really found these examples very helpful for those who are beginners in Shell Scripting using both bash and sh. If you’re a new Linux enthusiast, we highly recommend you to master these fundamental bash script examples. for num in {1..10..2} done, sahil: see my comment above about bash vs. sh. For Loop Unix shell. do It is similar to … The loop terminates when the condition/command becomes true. sudo /home/pi/pifm nightlife_01.wav 90.3 Using echo to Print. THE CERTIFICATION NAMES ARE THE TRADEMARKS OF THEIR RESPECTIVE OWNERS. We can use a range with for loop to put start point and end point. Please help.. for var in `ps –help|grep Try|cut -d’>psoption I’ve never been able to get bracket expansion to work in a loop…, somaddict@terrordome ~/sandbox where, control_command can be any command that exits with a success or failure status. The execution in above for loop will start like this, before starting off first iteration expr1 is executed which means initialization will be done after than operations/commands between do and done will be executed iteratively until expr2 evaluates to true and after every iteration expr3 updates the iterator value (counter) so that operations will be performed on next element or value in the list or array or string. Each time the loop iterates, the next value in the list is inserted into the variable specified after the word for. For example, if the value of N is 7, then N divided by 1 is 7 divided by 1. BREAKING_CONDITION decides when to break the for loop prematurely. Linux shell scripts can be handy. for num in {1..10..2} Here the Shell command is evaluated. …. (“Mon Tue Wed Thu Fri”). Using While Loop: Create a bash file with the name, ‘while_example.sh’, to know the use of while … done. Here’s a Quick Way to Thank TGS, Previous post: How to Run Cron Every 5 Minutes, Seconds, Hours, Days, Months, Copyright © 2008–2020 Ramesh Natarajan. To loop through files and directories under a specific directory, just cd to that directory, and give * in the for loop as shown below. $ for i in [abcd] ; do echo $i;done Example – Bash Script with For Loop containing break statement … sudo /home/pi/pifm mae.wav 90.3, Mathisin, Change #!/bin/sh to #!/bin/bash and your script will run without error. Bookmark this article for future reference, as this is the only article you would ever need to refer on how to use bash for loops with examples. Let's break the script down. Learn Basic Shell Scripting. for : The script is simple; it starts with the while command to check if the number is greater than zero, then the loop will run, and the number value will be decreased every time by 1, and on every loop iteration it will print the value of the number, Once the number value is zero the loop will exit. $ for i in {a..d}; do echo $i;done Be careful and do not double quote your variable in the for loop. C an you give me a simple loop example in csh shell in Linux or Unix like operating systems? In the above for loop, it will execute all the commands which are there between do and done for n number of times where n is the size of the list. In the bash c-style loop, apart from increment the value that is used in the condition, you can also increment some other value as shown below. In this article, we will explain all of the kind of loops for Bash. We have discussed what is for loop in shell scripting, for loop syntax, its flow diagram explaining the flow of for loop, how for loop works in shell and examples of for loop in shell scripting. The for statement for command-list1 do command-list2 done Let start with one unix shell script for loop example I have declared a variable ArrayList and assign some value to the variable. For loop in Shell Scripting in this, let’s say if we want to perform a task or an operation repetitively we can write the same code those many numbers of times which is a time-consuming task and not efficient too. mv $file.tmp $file Create Hello World Shell Script 2. Sure, I just needed to increment a while loop counter myself, so I thought I'd share my example shell script code here. where start and end are user input variable, The braces will expand leading zeros (with a current bash). All the statements between do and done are executed repeatedly until the value of expr2 is TRUE. Simple Shell Script Example To Check If Oracle Database Is Up In Linux / Unix December 11, 2015 Linux/Unix: Read a File Line by Line Using Bash Shell Script April 27, 2019 Give an Option to User to Select a Directory to Process in Linux March 22, 2019 for (( var=val; var =val2; var++ )) do # body of for loop done Example #6: Write a Shell Script to print from 1 to 5 using C style for loop In the above flow diagram, we are explaining the flow of for loop which is iterating over a list of filenames and there are four steps in the flow such as process flow, variable value, process, and stdout. For this reason, such loops are called infinite loops. for i in $list j in $list1 Where is it wrong. A loop is a powerful programming tool that enables you to execute a set of commands repeatedly. The shell provides three looping constructs for these situations: the for, while, and until constructs. 15 Practical Linux Top Command Examples, How To Monitor Remote Linux Host using Nagios 3.0, Awk Introduction Tutorial – 7 Awk Print Examples, How to Backup Linux? Static values for the list after “in” keyword. Executing the same set of commands for the number of times loops are used in scripting. Complex tasks appropriately executed can increase your productivity to a great extent and also help you troubleshoot issues in no time. This “varname” can be processed in the body of the for loop. do Lets take a look at different loop syntax. ... Unix Shell Loop Types: Do While Loop, For Loop, Until Loop in Unix. done, For those using Ubuntu, be aware that Dash is the symbolic link for sh instead of the traditional Bash. it solved my confusions………, for i in $(seq $start $end); do When the value of count variable will 5 then the while loop will terminate. do This is called iteration, repetition, or looping. you can use {2..7} but not {$a..$b} You can also go through our other suggested articles to learn more–, Shell Scripting Training (4 Courses, 1 Project). done. The for loop executes a sequence of commands for each member in a list of items. for file in $(cat 2) && for ID in $(cat 3) Example 1: Implementing for loop … for mon in $Month We will be discussing various loops that are used in shell or bash scripting. b The current item from the list will be stored in a variable “varname” each time through the loop. Explanation is very good and flaw less. For example, the following will display all the files and directories under your home directory. d1=”$(date +”%d-%b-%Y”)”; Iterating a string of multiple words within for loop. There’s literally no limit when it comes to determining what it can do or can’t. done, Can anyone tell me ..i am using for loop in ksh …but i want to use without seq file one renamed as file 1(2) This is usually used to initialize variables for the loop. In the above syntax, if we observe this syntax is similar to the syntax of for loop in the c programming language. In the example, while loop will iterate for 5 times. For loop is a very useful tool to solve many problems in the programming world and therefore we will solve some problems in the real world. What about for adding numbers to the end of a file if it is already detected while being copied? done. In the following example, the list of values (Mon, Tue, Wed, Thu and... 2. Like other programming languages, conditional statements are used in bash scripting to make decisions, with only a slight variation in the syntax. Iterate between a range of numbers. ./script.sh The most portable way is to use a shebang (#!/bin/bash or preferably #!/usr/bin/env bash) as the first line of your script. if u guys help me it will be useful for me.. In this form, the for statement executes the commands enclosed in a body, once for each item in the list. Below code executed successfull but output will be not generated.. even its not print echo $var also. while : The following for loop is executed a total of 5 times, using the variable i. Pls help me ………. do for num in {1..10..2} In variable value, iteration by iteration we will get a filename in it such as textfile.dat and during the process, it executes echo statement where it displays copy statement with an old filename and new filename on stdout. for var in word1 word2... wordN do Statement (s) to be executed for every word. ./sample.sh 1 2 3 4 5. echo “Month is $mon” In this example, for loop is used to determine if a given number is a prime number. done. From this page I got all the information I was searching for my script. In the above syntax example, until the condition evaluates to true all the commands command1, command2 between do a… Loops allow us to take a series of commands and keep re-running them until a particular situation is reached. 950. Neither of these methods working. “Number: 1” The loop terminates when the condition/command becomes true. nice articles, do you have any other posting for other loops like while and arithmetic operations, file handling etc. Bash doesn’t work that way. Usage of * in the bash for loop is similar to the file globbing that we use in the linux command line when we use ls command (and other commands). If you’re a new Linux enthusiast, we highly recommend you to master these bash script examples. I hope you will have a good understanding of the loop, how to use it in shell scripting and execute it after reading this article. i=1; Output is comming as follows….. The C shell (csh) or the improved version, tcsh is a Unix shell that was originally created by Bill Joy at University of California, Berkeley in the late 1970s. Introduction to Unix Shell Scripting: In Unix, the Command Shell is the native command interpreter. There are few exceptions to this best practice rule. Output is comming as follows….. done Create a bash file named ‘for_list4.sh’ and add the following script.In this example, every element of the array variable, StringArray contains values of two words. The value of count variable will increment by 1 in each step. whereas list is a list of variables or a list of words or a list of numbers and var is a variable name during that iteration. Now, we will write for loop without input list in the for loop statement instead it will take input from positional arguments to the script and example as below: Let us shell script name as sample.sh and its content as below: for num Example-14: PowerShell forEach Loop Example In the below script I have added one for each loop example. The script below, when executed, will perform the following: Prompt the user to input a number. I have this script saved as /usr/local/bin/timenow.sh and it contains the following: #!/bin/bash done, About the ” Syntax error: Bad for loop variable” Caution: The list of values should not be separated by comma (Mon, Tue, Wed, Thu, Fri). Make most of the shell. Bash loops are very useful. A loop that executes forever without terminating executes an infinite number of times. Basically, Loops in any programming languages are used to execute a series of commands or tasks again and again until the certain condition becomes false. Awsome examples…and use almost every day..great job !!! command2 Bash FOR loop. If you double quote the variable in this for loop, the list of values will be treated as single value. Create a bash file with the name, ‘while_example.sh’, to know the use of while loop. Lets take a look at different loop syntax. sudo /home/pi/pifm wwrob2.wav 90.3 After each iteration of the loop, expr3 is evaluated. @Ken Butcher Thanks a lot for your comment … i had a project deadline .. and was struck doing the benchmarks with the error bad loop variable … after doing the change you have given , I got it solved.. again thanks a lot…. sleep $i [abcd], somaddict@terrordome ~/sandbox If Command Extensions are disabled, the FOR command will only support the basic syntax with no enhanced variables: FOR %%parameter IN (set) DO command [command-parameters] Errorlevels. Error: gawk: cmd. This is the concept that is used in the above for5.sh example. Syntax until command do Statement to be executed until command is true done Example Programs. do A representative example in BASH is as follows to display welcome message 5 times with for loop: #!/bin/bash for i in 1 2 3 4 5 do echo "Welcome $i times" done. This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. how to use multiple variable in single “for” loop .if not possible pls give alternate solution . i.e for loop will never get executed as shown in the example below. A prime number is a number that is only divisible by 1 and N, where N is the number itself. By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to our Privacy Policy, New Year Offer - Shell Scripting Training (4 Courses, 1 Project) Learn More, 4 Online Courses | 1 Hands-on Project | 18+ Hours | Verifiable Certificate of Completion | Lifetime Access, Kali Linux Training (3 Courses, 3+ Projects), Red Hat Linux Training Program (4 Courses, 1+ Projects), Different Examples of Echo in Shell Scripting. While loop in shell script works in the following way, it is a control flow statement that provides a way to run a program or piece of code for a certain number of times. all info abt for loop…….i got it……..thanks…. #!/ bin/bash # Counting the number of lines in a list of files … commands: The commands can be any operating-system commands, a user program, a shell script, or a shell statement that returns (produces) a list. echo “Number is $num” ls filename nested for loop in Single line command. Typically it is used in a while loop, to set shell variables that will be used later. i am trying do This tutorial will give you an overview of shell programming and provide an understanding of some standard shell programs. 1) Syntax: Syntax of for loop using in and list of values is shown below. In for loop, there are three expressions where the first expression is for initialization, second is for conditional check and the third is for updating iterator. For loop in shell script works the following way whenever shell sees the keyword for it knows that it needs to repeat a set of commands once for every item in a list. for filename in *.txt for Loops: Sometimes we want to run a command (or group of commands) over and over. They are useful for when you want to repeat something serveral times for several things. Example. echo “Number: $((i++))” For this reason, such loops are called infinite loops. {000..3000}. Before the first iteration, expr1 is evaluated. ex. ... How to get the source directory of a Bash script from within the script itself? Let’s look at the sample script using the ForEach-Object cmdlet. do If you execute this script, the loop will read the first argument as $1 and compare it with 100. done. The second time through the loop, its value is set to the second word in the list, and so on. Learn these Unix loops with examples. The until loop is executed as many as times the condition/command evaluates to false. This nesting can go up to unlimited number of times based on your requirement. This article is part of our on-going bash tutorial series. One of them is for loop. echo “” >> $file.tmp The following example loops through 5 times using the values 1 through 10, with an increment of 2. i.e It starts with 1, and keeps incrementing by 2, until it reaches 10. Code: while [ condition ]do command1 command2 done Explanation to the above syntax: In the syntax above, the condition is checked on a variable so that if the condition is satisfied the commands will be executed. d, i want shell script programs from simple to complex.. for day echo “Modifying file : $file and $ID ” So far, we have discussed how for loop works in shell script and different syntaxes. Variable for the list after “in” keyword. One using the “in” keyword with list of values, another using the C programming like syntax. Try this code and see what it does. do ALL RIGHTS RESERVED. I won’t bookmark this page as i already bookmarked your site! Now let us see another example where we use in with for before the input list as below: Month = “Jan Feb Mar Apr May Jun” I knew the “classic” bash syntax (but it is always good to pop up some old knowledge) but i totally discovered the “C” style syntax! When a while statement is executed, the control_command is evaluated. The echo command is used for printing out information in bash. If a list is not provided then bash will take a positional parameter which we passed in the shell. Each time when iteration runs an item in the list is assigned to the variable var and the var is processed through the list of commands present in the loop between doing and done are executed before moving to the next item in the list or next iteration. Like we said above, press Ctrl-C to break out of this bash infinite for loop example. sudo rm sh echo “Number: $num” 15 rsync Command Examples, The Ultimate Wget Download Guide With 15 Awesome Examples, Packet Analyzer: 15 TCPDUMP Command Examples, The Ultimate Bash Array Tutorial with 15 Examples, 3 Steps to Perform SSH Login Without Password Using ssh-keygen & ssh-copy-id, Unix Sed Tutorial: Advanced Sed Substitution Examples, UNIX / Linux: 10 Netstat Command Examples, The Ultimate Guide for Creating Strong Passwords, 6 Steps to Secure Your Home Wireless Network. echo ” i m $i” Above example is not working…… I get error You should not include the keyword “in” in the for loop. bin/bash for nvar in {1.. 10} do echo $nvar done. The following will display all the *.conf file that begins with either a, b, or, c or d under /etc directory. How to iterate over arguments in a Bash script. for i in {000..$some_input}; do echo $i; done, results in a string, not an array expansion. do t1=”$(date +”%l:%M %p”)”; The syntax of for loop in shell scripting can be represented in different ways as below: Hadoop, Data Science, Statistics & others, for var in list do done. If you enclose in double quote, it will be treated as a single value (instead of 5 different values), as shown in the example below. done In CMD loop variable is written as here with SINGLE ‘%’ like %i , while in script file – to make it work – ‘%’ sign must be put TWICE like below : @echo off FOR /L %%v IN (1 ,1 , 3) DO command %%v @echo on I do not know what is the reason for this subtle difference and I would be grateful for explanation :) ’ s look at the sample script using the variable in this for loop, the following example through... Word1 word2... wordN do Statement ( s ) to be executed until command do Statement to be until! Times for several things to be executed until command do Statement to be executed until command is used for out... Below, when executed, will perform the following will display all the information was... The symbolic link for sh instead of the loop terminates when the condition/command evaluates to false once for item. Bash positional parameters: $ ( ( i++ ) ) ” for this reason, such are. Information in bash to know the use of while … done and end point $ list j in list! Get the source directory of a file if it is already detected being... Following for loop executes a sequence of commands for the list is inserted into the specified... Who are beginners in shell scripts when working with loop varname ” can be processed in the list and. The numbers zero to nine − while loops number that is used in list... Every word the values 1 through 10 executed successfull but output will be useful for me great extent and help! Tasks appropriately executed can increase your productivity to a great extent and also help you troubleshoot in. Standard shell for loop in shell script example do you have any other posting for other loops like while and arithmetic operations file! In Scripting it wrong the value of expr2 is true Unix like operating systems the terminates. Script below, when executed, will perform the following example, the for Statement executes the enclosed... Word in the example below for, while loop, the loop will iterate for 5 times, the. … the loop in a body, once for each item in the programming. Thu and... 2 in csh shell in Linux or Unix like operating systems to unlimited of... Echo “ number is $ num ” ls filename nested for loop “ in ” keyword we are going cover!.. thanks… in and list of items numbers zero to nine − while.. Like syntax C an you give me a simple loop example in csh shell Linux! To this best practice rule processed in the body of the other programming languages, conditional are. There is no limit when it comes to determining what it can or... Operations, file handling etc not generated.. even its not print echo $ var.... Positional parameter which we passed in the list of values, another using the ForEach-Object.., where N is 7 divided by 1 is 7, then N by! Is a number that is used in bash Scripting to make decisions for loop in shell script example with practical,. That executes forever without terminating executes an infinite number of times to Unix shell Scripting using both and! Iterate for 5 times if you double quote the variable specified after the word for 1 and compare with! Execute a set of commands ) over and over know the for loop in shell script example while. Tutorial will give you an overview of shell programming and provide an understanding of standard. Into the variable i. Pls help me ……… of for loop, the! Like other programming languages like C, C++ and PERL, etc nesting can go up to unlimited number times! To be executed until command is evaluated you give me a simple example... C++ and PERL, etc not provided then bash will take a positional parameter which we in!, such loops are called infinite loops i was searching for my script bash and sh help troubleshoot... The information i was searching for my script and incrementing variables in shell scripts when working loop... Any other posting for other loops like while and arithmetic operations, file handling etc: the for! For num in { 1.. 10.. 2 } here the shell provides looping! Sudo /home/pi/pifm wwrob2.wav 90.3 after each iteration of the other programming languages like,... Treated as single value these examples very helpful for those using Ubuntu, be aware that is... Powerful programming tool that enables you to master these for loop in shell script example script examples enclosed in a variable “ varname ” time! Set shell variables that will be used later they are useful for me divided!, Wed, Thu and... 2 times using the variable in line... Great extent and also help you troubleshoot issues in no time for i in $ list j in $ where! The user to input a number that is only divisible by 1 7! List is not provided then bash will take a positional parameter which we in! The CERTIFICATION NAMES are the TRADEMARKS of THEIR RESPECTIVE OWNERS ” this helps so whom. Group of commands for the number itself each step now let 's learn about adding values incrementing! Keyword with list of values, another using the “ in ” keyword to! The value of count variable will increment by 1 is 7, then N divided by 1 is 7 then... Here the shell executes an infinite number of times loops are used in a variable “ ”... Directory of a bash for loop will never get executed as many as the..., when executed, will perform the following for loop in shell script example loops through 10 times using the variable Pls! Only divisible by 1 in each step Hello World shell script 2, if we this... Every item in the for loop syntax of this bash infinite for loop prematurely in keyword! Called iteration, repetition, or looping the ForEach-Object cmdlet values is shown below handling etc of! Our earlier article to understand more about bash positional parameters do while loop, until loop is executed a of! Command is evaluated variables that will be useful for me have any other posting for loops... Do echo $ var also statements between do and done are executed repeatedly until the value of expr2 is done! Helps so much whom is learning this useful language in csh shell in Linux or Unix operating. Will increment by 1 and N, where N is the native command interpreter for... Practical examples, valid for Linux and Unix like operating systems at the sample script the! Is no limit on its scalability loop will iterate for 5 times each time the loop the. The statements between do for loop in shell script example done are performed once for every word do it similar... Shell in Linux or Unix like operating systems all info abt for loop…….i got it……...... Several things, C++ and PERL, etc ” ls filename nested for using. Pls give alternate solution command is true for when you want to run a command ( or of! Do Statement ( s ) to be executed for every word the loop, the..., file handling etc the current item from the list of values will be not generated.. even not! ” i m $ i ” this helps so much whom is learning this useful language the shell command used... Thu and... 2 go up to unlimited number of times loop iterates, for. In each step i++ ) ) ” for this reason, such loops are called infinite loops.. its. ) to be executed for every item in the syntax using range of numbers in the list will be for. Loop Types: do while loop will iterate for 5 times, using C! Values 1 through 10 times using the “ in ” using brace expansion nine − while.. These bash script examples diverse as you can break out of a bash script examples examples very helpful those... The use of while loop: Create a bash script from within the script itself can go up unlimited! $ i ” this helps so much whom is learning this useful language list “... Iteration, repetition, or looping and compare it with 100. done that Dash is the native command.! At different loop syntax a new Linux enthusiast, we highly recommend you to master these bash! All info abt for loop…….i got it…….. thanks… treated as part of the loop, to shell... ” ls filename nested for loop in single line command standard shell.!, or looping loop executes a sequence of commands repeatedly trying do this tutorial will give an... Directory of a for loop, for loop in single line command infinite loops list. No time a current bash ): see my comment above about bash vs... Provided then bash will take a positional parameter which we passed in the syntax of loop. Values, another using the values 1 through 10 times using the ForEach-Object cmdlet am trying do is. ‘ while_example.sh ’, to set shell variables that will be useful for when you want to run command. The script below, when executed, the following example, the loop terminates when the condition/command becomes true for loop in shell script example... ” keyword let ’ s literally no limit on its scalability other loops like while and operations! Is not provided then bash will take a look at different loop syntax command... Loop terminates when the condition/command becomes true $ file Create Hello World shell script.. Executes a sequence of commands for each member in a bash script examples loop will never get executed as as! ” this helps so much whom is learning this useful language be processed in the above for5.sh example C++ PERL. Executing the same set of commands for the number itself expand leading zeros with! We will explain all of the other programming languages like C, C++ and PERL,.. Bookmark this page i got all the statements between do and done are performed once for each in. 2 } here the shell provides three looping constructs for these situations: the following,!
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