26 мар. 2015 г. · You can use -z to test whether a variable is unset or empty: if [[ -z $DB || -z $HOST || -z $DATE ]]; then echo 'one or more variables are undefined' exit 1 fi ... How to test multiple variables for empty string - bash Check if multiple Bash variable are empty/not set and run this ... Bash non-null/non-zero check multiple string variables Другие результаты с сайта stackoverflow.com

24 окт. 2008 г. · I need to check if \\$1 or \\$2 are empty before continuing but I don't know if bash has any logic of the sort. This is what I'm looking for ...

25 мар. 2014 г. · How can I make sure that all required variables are set? Update/Solution: I know that there is a difference between "set" and "set, but empty". If Statement with 2 Variables - Bash shell script - Test if $1 OR $2 are null with "-z" - BASH bash - Assign the same string to multiple variables bash - How to read multiple variables from a file Другие результаты с сайта unix.stackexchange.com

19 мар. 2022 г. · You can pass the -z option to the if command or conditional expression. If the length of STRING is zero, variable ($var) is empty.

19 сент. 2017 г. · Let's say you have a dozen variables in your script and you need to check if they have values set. The usual approach can get a bit tedious.

12 мая 2009 г. · You can test to see if a variable is specifically unset (as distinct from an empty string): if [[ -z ${variable+x} ]] where the "x" is arbitrary.

11 авг. 2014 г. · I want to detect when a variable actually contains more than one line of text, disregarding extra trailing newline characters.

29 авг. 2012 г. · I am looking for a test that would return true if the environment variable is defined and has a value different than 0, false or NULL.

21 янв. 2022 г. · I have a scenario where I have a more than 20 variable and I need to check each variable contain some value. I can use string.IsNullOrEmpty(var) function. Не найдено: bash | Нужно включить: bash

5 июл. 2021 г. · read -r video audio will capture the first ($IFS separated) word into "video" and the rest of the line into "audio"