Bash, short for "Bourne Again SHell," is a powerful scripting language used in Unix-based operating systems. One of the fundamental constructs in Bash programming is the if statement. The if statement allows you to control the flow of your script based on specific conditions. In this article,...
Using a Bash If Statement with multiple conditions Using Nested If Statements Common Pitfalls and Errors Incorrect usage of the single bracket command [ How to solve the Binary Operator Expected Error? Why you should not use the || and && operators instead of a Bash If Statement? Detailed Exam...
The main advantage of using ‘else if’ in bash scripting is that it allows your scripts to handle multiple conditions, making them more flexible and powerful. However, it’s important to be aware of potential pitfalls. For instance, the order of your conditions matters. The script will execu...
/bin/bash# Check if the file "abc.sh" existsif[-e"abc.sh"];then# Check if the file is executableif[-x"abc.sh"];then# If executable, run the script./abc.shelse# If not executable, print messageecho"Script is not executable"fielse# If the file does not exist, print messageecho"...
If we run this, we will get:$ ./my_script 1) bower 2) npm 3) gem 4) pip Choose the package manager: 2 Enter the package name: bash-handbook <installing bash-handbook> Loop controlThere are situations when we need to stop a loop before its normal ending or step over an iteration....
if [ $? -eq 0 ]; then: Checks the exit status of the previous command. If it's 0 (indicating success), print a success message. Otherwise, it prints a failure message. 9. Write a Bash script that performs a simple arithmetic operation using user input. ...
command || true Don't skimp on if-statements. You can't use && as a shorthand if-statement without always using || as an else-branch. Otherwise, the script terminates if the condition is false.Bad:command && … Good (contrived):command && … || true ...
We can also write that script using the case statement. In the case statements, ;; represents a case break, so if the variable value meets any of the conditions, it jumps to the end of the script:#!/bin/bashecho "Enter a valid number"read ncase $n in101)echo "This is the first...
If you run the script, it will print something like this: PID:36353Exit status:0 Here’s an example using the -n option: #!/bin/bashsleep3&sleep30&sleep5&wait-necho"First job completed."waitecho"All jobs completed." When the script is executed, it spawns 3 background processes. wait...
A loop is a statement in a bash programming language that allows code to be repeatedly executed. You can set specific conditions during the script execution. Loops Explanation if then fi Used to test a condition. if then else fi Used to test a condition and use a fallback if the test fa...