#!/bin/bash # Calculate the week number using the date command: WEEKOFFSET=$[ $(date +"%V") % 2 ] # Test if we have a remainder. Note : In bash, respect each token/literal.
This is referred to as indenting and is an important part of writing good, clean code (in any language, not just Bash scripts). It is also possible to have an if statement inside of another if statement.
Sometimes we only want to do something if multiple conditions are met. Here's an example of the simplest form of an if statement: In this example, the variable count specifies a condition that is used as part of the if statement.
if statement when used with optionn , returns true if the length ofthe string is greater than zero. When we refer to FILE above we are actually meaning a, Because [ ] is just a reference to the command, if [ $USER == 'bob' ] || [ $USER == 'andy' ], space_free=$( df -h | awk '{ print $5 }' | sort -n | tail -n 1 | sed 's/%//' ). In this section of our Bash Scripting Tutorial you will learn the ways you may use if statements in your Bash scripts to help automate tasks.
It will print to the screen the larger of the two numbers. The echo statement prints its argument, in this case, the value of the variable count, to the terminal window. it is not empty).
It's a little hard to explain so here are some examples to illustrate: case
The final else is also optional. An example of multiple elif conditions is: A more compact way to write such statements with multiple conditions is the case method. www.tutorialkart.com - ©Copyright-TutorialKart 2018, # ^ ^ ^ ^ ^ ^ ^, # FALSE && TRUE || FALSE || TRUE evaluates to TRUE, # FALSE && TRUE || FALSE evaluates to FALSE, "Size of sample.txt is greater than zero", Options for IF statement in Bash Scripting, Example â Comparing strings using Bash If statement. Like what we have looked at in previous sections, their syntax is very specific so stay on top of all the little details.
If statements (and, closely related, case statements) allow us to make decisions in our Bash scripts. It functions similarly to the if statement with multiple elif clauses but is more concise. Bash way of writing Single and Multiline Comments, Salesforce Visualforce Interview Questions. In this topic, we shall provide examples for some mostly used options.
;; Check the below script and execute it on the shell with different-2 inputs. If statement can accept options to perform a specific task. Sometimes we may have a series of conditions that may lead to different paths. I would highly recommend you do indent your code however (especially as your scripts get larger) otherwise you will find it increasingly difficult to see the structure in your scripts.
A basic if statement effectively says, if a particular test is true, then perform a given set of actions. The length of STRING is greater than zero.
This means that all of the operators that test allows may be used here as well. If you aren't but you have a letter from your parents you may go but must be back before midnight.
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