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How to check if a macro value is empty or will not create text with plain TeX conditionals?
140882
Proper way to detect empty/blank text
63854
How do boolean operators work in 'if' conditions?
124765
How does bash interpret the equal operator with no surrounding spaces in a conditional?
114378
How to check if the string is empty?
143098
Even if the first command in if is true it doesn't print what i want , it only print the else command
150530
Comparing an argument to a string when argument is a result of a command with etoolbox
40229
How do I check if a variable exists?
50708
How to use OR condition in a JavaScript IF statement?
32293
What's the difference between if(!$variable) and if(isset($variable))?
88673
if...else...if statement (command not found error)
141442
Why does my string comparison fail?
146680
OR operator in C not working
102338
String comparison failing in bash
141259
shell scripting if statement doesn't work
17203
How to compare strings in C conditional preprocessor-directives
76966
How to use if - else structure in a batch file?