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Symbols - (minus) in command-line options, 26 operator, 56 in permissions, 11 in regular expressions, 43 in shell pattern matching, 14 -- (double minus) in command-line options, 26 operator, 56 -= operator, 56 _ (underscore) in filenames, 10 : (colon) in classpath, 24, 107, 119 in shell pattern matching, 14 in vi, 37, 43–45 ! (exclamation mark) operator, 56 in shell pattern matching, 14 != operator, 56 ? (question mark) as command-line option, 29 in shell pattern matching, 14, 196 in SQL, 333 in URLs, 406, 412 ?: operator, 56 / (forward slash) as file separator, 107 in HTML/XML, 221–222, 433 operator, 56 // comments, 66 /* ... */ comments, 66, 128 /** ... */ comments, 128 /= operator, 56 . (dot) as current working directory, 12, 20, 24, 29, 121, 238 in filenames, 10 in regular expressions, 43 .. (dot-dot) parent directory, 12 ... (ellipsis) in method declarations, 82 ^ (hat) for the Control key, 18 operator, 56 in regular expressions, 43 in shell pattern matching, 14 ^= operator, 56 ~ operator, 56 ' (single quote) for literals in SQL, 333 in shell pattern matching, 15 " (double quote) for Strings in Java, 60, 333 in shell pattern matching, 15, 108 [] (square brackets) array operator, 55–56 in regular expressions, 43 in shell pattern matching, 14 {} (braces) array operator, 55 for compound statements, 66–70 in Javadoc comments, 130 in shell pattern matching, 108 @ (at), 181 in command-line options, 117, 123 in Javadoc comments, 128 549 $ (dollar) in format fields, 81 in regular expressions, 43 in shell pattern matching, 15, 22 $$ environment variable, 108 * (asterisk) in import statements, 85–86 operator, 56 in password fields, 373 in regular expressions, 43 in shell pattern matching, 13, 16, 113, 196 *= operator, 56 \ (backslash) in shell pattern matching, 15 & (ampersand) operator, 56 in regular expressions, 43 in URLs, 406, 412 && operator, 56 &= operator, 56 # (hash) in comments, 196 in properties files, 111 % (per cent) operator, 56 in regular expressions, 43 %= operator, 56 + (plus) operator, 56, 60 in permissions, 11 in regular expressions, 43 in URLs, 413 ++ operator, 56 += operator, 56 < (less-than) operator, 56 as redirection command, 6 < ... > in command-line syntax, 73 in HTML/XML, 221 <? ... ?>, 222 <% ... %>, 426–431, 434 <%! ... %>, 429–430, 434 <%@ ... %>, 431–433 <%= ... %>, 430–431, 434 << operator, 56 <<= operator, 56 <= operator, 56 > (greater-than) operator, 56 as redirection command, 6 >= operator, 56 >> operator, 56 >>= operator, 56 >>> operator, 56 >>>= operator, 56 = operator, 56 == operator, 56, 61, 91 | operator, 56, 391 |= operator, 56 || operator, 56
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