What do empty curly brackets mean in bash?
100678
Understanding find(1)'s -exec option (curly braces & plus sign)
21319
Why should there be spaces around '[' and ']' in Bash?
64769
What is the difference between \empty and \@empty?
42134
Whats the difference between "${foo.bar}" and "#{foo.bar}"?
83053
Difference between [square brackets] and *asterisk
909
What is this shell/Bash syntax: someVariable=someValue someCommand
100395
Are empty arrays no longer allowed by gcc?
153835
Bash scripting: test for empty directory
132716
how to typeset empty inner product
98020
Why is my Bash script returning a syntax error?
92328
Curly brackets in URLs
45164
Do 'if' statements in JavaScript require curly braces?
100834
What does  (angle brackets) mean in Java?
91340
Testing if a variable is empty in a shell script
114539
${1:+"$@"} in /bin/sh
27742
What does "${-#*i}" != "$-" mean?
119974
What does << mean in Java?