Index[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [W] [Y] [Z] ! (bang) 2nd $( ) (command substitution) && (double ampersand) * (asterisk) 2nd 3rd - (dash) -R (dash R) option to commands . (period) .so (shared object) file / (forward slash) " (quotation marks) in regular expressions single quotes (') : (colon) ; (semicolon) < > (angle brackets) double right angle brackets right angle brackets ? (question mark) [ ] (square brackets) \ (backslash) _ (underscore) ` (backtick) {} (curly braces) | (pipe) double pipe text editors and ~ (tilde) |