In a shell script, aforloop allows you to iterate over a set of values or a range of numbers. Here are a few examples of how to useforloops in different contexts: Example 1: Iterating Over a List of Values #!/bi
Caution:Please be careful if you use this method. You should not include the keyword “in” in the for loop. If you leave the keyword “in” without any values, it will not use the positional parameter as shown below. It will not go inside the loop. i.e for loop will never get ex...
One can use the for loop statement even within a shell script. While the For Loop is a prime statement in many programming languages, we will focus on how to use it for the bash language. Are you ready to add yet another tool to your developer arsenal? Let’s explore deeper into the...
for i in {1..10} ;do userdel -r user$i ;done 3、/etc/rc.d/rc3.d目录下分别有多个以K开头和以S开头的文件;分别读取每个文件,以K开头的输出为文件加stop,以S开头的输出为文件名加start,如K34filename stop S66filename start for files in /etc/rc.d/rc3.d/[KS]* ;do if [ `basename $f...
Following shell script will go though all files stored in /etc directory. The for loop will be abandon when /etc/resolv.conf file found. #!/bin/bashforfilein/etc/*do if [ "${file}" == "/etc/resolv.conf" ] then countNameservers=$(grep -c nameserver /etc/resolv.conf) ...
Shell scripting, specifically Bash scripting, is a great way to automate repetitive or tedious tasks on your systems. Why type when you can schedule and run scripts in a hands-free manner? One of the many scripting constructs is the loop. A loop is a section of code that picks up data ...
In this tutorial, I explain how to use for, while and until loops in bash shell scripts, and demonstrate their use cases using shell script examples.Loop Statements: for vs. while vs. untilBoth the for and while statements allow you to express a loop with a terminating condition (i.e.,...
In this step, the expression in theRepeatplaceholder is run, which will update the current value of theInitialplaceholder. Then, the flow will go back to Step 2. Example:$num++ Using the PowerShell For Loop (Examples) The next sections will be some examples of how to use for loop in ...
for n in {1..7}; do echo $n done Once the shell script is executed, all the values in the range are listed, similar to what we had insimple loops. Bash For Loop with Ranges Example Additionally, we can include a value at the end of the range that is going to cause thefor loop...
7. Awk Exit Example: Exit from the loop at 5th iteration $ awk 'BEGIN{ x=1; while(x<=10) { if(x==5){ exit;} print "Value of x",x;x++; } }' Value of x 1 Value of x 2 Value of x 3 Value of x 4 In the above script, once the value of x reaches 5, it calls ex...