bash functions: enclosing the body in braces vs. parentheses

Why are braces used by default to enclose the function body instead of parentheses? The body of a function can be any compound command. This is typically { list; }, but three other forms of compound commands are technically allowed: (list), ((expression)), and [[ expression ]]. C and languages in the C family like C++, … Read more

Parenthesis/Brackets Matching using Stack algorithm

Your code has some confusion in its handling of the ‘{‘ and ‘}’ characters. It should be entirely parallel to how you handle ‘(‘ and ‘)’. This code, modified slightly from yours, seems to work properly: public static boolean isParenthesisMatch(String str) { if (str.charAt(0) == ‘{‘) return false; Stack<Character> stack = new Stack<Character>(); char c; … Read more

Why is it customary to put many closing parentheses on one line in Lisp-based languages?

In Lisp and other languages that use S-expressions for syntax, the parentheses are primarily for the benefit of the compiler, while layout and indentation (which are ignored by the compiler) are for the benefit of programmers. So there is no need to put closing parentheses on their own lines: well-chosen line breaks and indentation will … Read more

What are the parentheses used for in a bash shell script function definition like “f () {}”? Is it different than using the “function” keyword?

The keyword function has been deprecated in favor of function_name() for portability with the POSIX spec A function is a user-defined name that is used as a simple command to call a compound command with new positional parameters. A function is defined with a “function definition command”. The format of a function definition command is … Read more

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