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Is it possible to use “if 0” command?

Here you will find out:

  • why IF statements are
  • how you can change an unsuccessful status to successful
  • whether the bash command “if 0” works or not
  • when DiskInternals can help you

Are you ready? Let's read!

About IF statements

When writing a shell script, you sometimes want to initiate decisions or conditions, and to achieve this; you need to introduce the IF statement. The simplest syntax for a bash IF statement is:

if CONDITIONS; then COMMANDS; fi

The “CONDITIONS” are tests you wish to run and return “True” before the “COMMANDS” will run. However, if the "CONDITIONS" do not return "True", the "COMMANDS" will not run. Indeed, your commands will run only if the "CONDITIONS" return "True".

Note: Your “CONDITIONS” returning “True” simply means getting “0” (zero) as the response code. Any other response code besides “0” will cause your “COMMANDS” to not run.

How to change an unsuccessful status to successful

Since the IF statement requires that your conditions must return “True” (0) to run your “COMMANDS”, here’s how to manipulate the response code to print “0” regardless of whether the conditions were met or not.

Using the “!” operator, you can turn a successful test to print a nonzero number and vice versa.

Example

By introducing the “!” operator, the return code will print “0” if the conditions are unsuccessful and print “1” if the conditions are successful.

Does the bash command “if 0” work?

Some people have asked if the bash command "if 0" works, and the simple answer to that question is explained below.

Example

The example above will return an error response that reads: “…command not found”.

However, here’s the correct way to write the script:

This one will run successfully.

The initial error “…command not found” is due to the fact that “0” is not a command and IF expects to get return code from a command. "True" is a command, and "0" is not.

What will the “if 0” command execute?

This will tell IF to run a return code “0”, which is not a command. IF works for conditions and commands, not return codes. Commands include “true”, “false”, and “test”.

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