Domain and web hosting - O’Reilly Books Latest LAMP Titles: mod_perl Pocket Reference
O’Reilly Books Latest LAMP Titles: mod_perl Pocket Reference SQL in a Nutshell Network Printing Books by topic: Linux Open Source Security System and Network Administration Unix Web and Internet O’Reilly Network Technologies: ONJava.com ONLamp.com openp2p.com Perl.com XML.com Apache BSD Java Javascript and CSS Linux Mac Mozilla .NET P2P Perl Policy PHP Python Web Services Wireless Use these to compare two arguments. Arguments can also be words, in which case comparisons are defined by the locale. If the comparison statement is true, the result is 1; if false, the result is 0. Symbols > and < must be escaped. =, == Are the arguments equal? != Are the arguments different? > Is arg1 greater than arg2? >= Is arg1 greater than or equal to arg2? < Is arg1 less than arg2? <= Is arg1 less than or equal to arg2? Logical operators Use these to compare two arguments. Depending on the values, the result can be arg1 (or some portion of it), arg2, or 0. Symbols | and & must be escaped. | Logical OR; if arg1 has a nonzero (and nonnull) value, the result is arg1; otherwise, the result is arg2. & Logical AND; if both arg1 and arg2 have a nonzero (and nonnull) value, the result is arg1; otherwise, the result is 0. : Like grep; arg2 is a pattern to search for in arg1. arg2 must be a regular expression. If part of the arg2 pattern is enclosed in ( ), the result is the portion of arg1 that matches; otherwise, the result is simply the number of characters that match. By default, a pattern match always applies to the beginning of the first argument (the search string implicitly begins with a ^). Start the search string with .* to match other parts of the string. Keywords index string character-list Return the first position in string that matches the first possible character in character-list. Continue through character-list until a match is found, or return 0.