1. Bash If..then..fi statement if [ conditional expression ] then statement1 statement2 . fi This if statement is also called as simple if statement. If the given conditional expression is true, it enters and e
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,...
You can put anifstatement inside anotherifstatement. This is perfectly acceptable, but nestingifstatements makes for code that is less easy to read, and more difficult to maintain. If you find yourself nesting more than two or three levels ofifstatements, you probably need to reorganize the lo...
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 Examples & FAQ How to check if a variable exists or...
Examples: [ n1 -eq n2 ] (true if n1 same as n2, else false) [ n1 -ge n2 ] (true if n1greater then or equal to n2, else false) [ n1 -le n2 ] (true if n1 less then or equal to n2, else false) [ n1 -ne n2 ] (true if n1 is not same as n2, else false) [ n1 ...
If you are comparing strings, you can use these test conditions: There are also conditions for file type check: Now that you are aware of the various comparison expressions let's see them in action in various examples. Use if statement in bash ...
It compares the two numbers using an "if" statement. It returns the smaller of the two numbers. User input: The script prompts the user to enter two numbers. It validates that the inputs are valid numbers (allowing for negative numbers and decimal points). ...
Using if-else statement in bash You may have noticed that you don’t get any output when you run theroot.shscript as a regular user. Any code you want to run when an if condition is evaluated to false can be included in an else statement as follows: ...
if [[ $string2 = *"Bash"* ]] then printf "Contains word 'Bash'. \n" else printf "Does not contain the word. \n" fi 如何把for语句放在一行里执行? #!/bin/bash # For statement in multiple lines for((i=1;i<10;i+=2))
In this article let us review the bash case command with 5 practical examples. The case construct in bash shell allows us to test strings against patterns that can contain wild card characters. Bash case statement is the simplest form of thebash if-then-else statement. ...