A nested loop is a loop within a loop. When working with arrays, you might find a situation where you need to loop through multiple arrays simultaneously. For example, you might have a script that needs to compare the elements of two arrays. Here’s an example: fruits=('apple' 'banana'...
Define two numbers:The script initializes two variables,num1andnum2, with values20and15, respectively. Compare the numbers:Theifstatement uses the-geoperator to check if the value ofnum1is greater than or equal tonum2. Execute the true condition:If the condition evaluates to true (the first...
The first argument to your script is stored in$1, the second argument is stored in$2, etc, etc. An array of all of the arguments passed to your script is stored in$@, and we’ll discuss how to handle arrays later on in this chapter. The total number of arguments passed to your s...
For example, the below-given Bash script is printing numbers 1 to 5 to the standard output. Use thebreakstatement to exit the loop when the counter reaches 4. #!/bin/bash i=0 while [ $i -lt 5 ] do i=$(( $i+1 )) if [ $i -eq 4 ] then break fi echo $i done Bash while...
The second command line uses echo to print out the value of testvar. The output of that script will be:This is a test variableLet’s take a look at how you can enter a string value by using the read command and make the script compare two string values from different variables:...
Add constants to explain magic numbers: # Add at the top of the script readonly SIGNAL_EXIT_CODE=256 readonly SIGTERM=15 readonly SIGNAL_EXIT_OFFSET=128 Consider simplifying the nested conditions: -if [[ "${exit_code_service}" -eq 256 ]]; then +if [[ "${exit_code_service}" -...
aws_eks_ami_create.sh - creates a custom EKS AMI quickly off the base EKS template and then running a shell script in it before saving it to a new AMI. See also HariSekhon/Packer for more advanced build aws_kms_key_rotation_enabled.sh - lists AWS KMS keys and whether they have key...
This problem involves writing a Bash script that defines a function named minimum to determine and return the minimum of two given numbers. The script should include logic to compare the two input numbers and output the smaller one. Code: ...
'{ print ($1 * 10000) + ($2 * 100) + $3 }') # Compare versions if ((current_version_num < required_version_num)); then echo "Error: This script requires Bash version $required_version or higher." echo "Your current Bash version is number is $current_version." exit 1 fi { ...
How to shuffle the elements of an Array in a shell script? There are two reasonable options to shuffle the elements of a bash array in a shell script. First, you can either use the external command-line tool shuf that comes with the GNU coreutils, or sort -R in older coreutils versions...