Portable way to check emptyness of a shell variable
19713
Why do shell script comparisons often use x$VAR = xyes?
64756
Finding empty directories recursively
12795
Getting "ensure" / "finally" functionality in a shell command (not script)?
145303
Equivalent of !$A.util.isEmpty() in LWC
6958
How can I check if a program exists from a Bash script?
601
How do I test for an empty JavaScript object?
29812
How do I test if a variable is a number in Bash?
158391
Most efficient way to check for DBNull and then assign to a variable?
108661
In php, is 0 treated as empty?
102826
Easy way to check that a variable is defined in python?
86719
How to check if file is empty or it has only blank characters?
130165
Assigning default values to shell variables with a single command in bash
17361
How to check if a string has spaces in Bash shell
108681
What is the $? (dollar question mark) variable in shell scripting?
94783
How to find all empty files and folders in a specific directory including files which just look empty but are not?
65944
Easier way of writing null or empty?
576
How can I check for an empty/undefined/null string in JavaScript?