Difference between 'if [ "x$foo" = "x1" ]' vs 'if [ "$foo" = "1" ]' in bash?
19713
Why do shell script comparisons often use x$VAR = xyes?
5528
Difference between $:=$ and $=$
151825
Is there any difference between "foo is None" and "foo == None"?
45164
Do 'if' statements in JavaScript require curly braces?
25478
What does ${1+"$@"} mean in a shell script, and how does it differ from "$@"?
124650
Is `if (condition = value)` the correct syntax for comparison?
11651
What does curly brackets in the `var { ... } = ...` statements do?
1528
Simple logical operators in Bash
83409
Difference between $ and # in Linux environment
52584
Is test or [ or [[ more portable both between bash shells and between other shells?
1469
Is there a difference between "==" and "is"?
39485
Why does ('0' ? 'a' : 'b') behave different than ('0' == true ? 'a' : 'b')
42605
Is there a technical reason to use > (<) instead of != when incrementing by 1 in a 'for' loop?
38402
What is the meaning of the ${0##...} syntax with variable, braces and hash character in bash?
5097
How to compare two floating point numbers in Bash?
75335
Bash test: what does "=~" do?
120372
How to typeset $:=$ correctly?