Bash not null string

That is why our terminal prompted us to enter a valid string, as shown in the following image:. By using these flags, we can test any strings and hence use them very efficiently in our scripts. I am a self-motivated information technology professional with a passion for writing. I am a technical writer and love to write for all Linux flavors and Windows. Note: Linux Mint 20 is used to test the following examples. Aqsa Yasin I am a self-motivated information technology professional with a passion for writing.

Below is an example:. Most importantly, you should add spaces around the square brackets. If there are no spaces, bash will complain about that. Also, since any bash test without an argument will always return true, it is advisable to quote the variables so that the test will have at least an empty argument, irrespective of whether the variable is set or not. Learn more. What's a null string in bash Ask Question. Asked 9 years, 7 months ago. Active 9 years, 7 months ago. Viewed times. What exactly is meant by null string?

Improve this question. Add a comment. Active Oldest Votes. A "null string" is one which has zero length. In your example, both are the same.