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Table 3: String: , Logical, File, and Assignment Operators String Comparisons Function ! command not command File Tests -e -f -s -z -r -w -x -d -B -T Assignment Operator = Control Stucture LABEL:{ statements; } Conditional Control Structures: if, else, elsif, case if( expression ) { statements; } if( expression ) { statements; } else( expression ) { statements; } if( expression ) { statements; } elsif( expression ) { statements; } else( expression ) { statements; } if executes statements if its test expression is true. Statements must be included within a block. if-else executes statements if the test expression is true; if false, the else statements are executed. Assign a value to a variable. Table 4: Perl: Conditions, Loops, and Functions Description Block is a collection of statements enclosed within opening and closing braces. The statements are executed sequentially. The block can be labeled. File exists. File exists and is a regular file. File is not empty. File is empty, zero size. File is readable. File can be written to, modified. File is executable. Filename is a directory name. File is a binary file. File is a text file. The logical NOT condition inverts the true or false value of the expression. The not operation is the same as ! but has a lower precedence.
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elsif allows you to nest if structures, enabling selection among several alternatives; at the first true if expression, its statements are executed and control leaves the entire elsif structure.
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Control Stucture unless( expression ) { statements; } test stat1 : stat2
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Table 4: Perl: Conditions, Loops, and Functions Description unless executes statements if its test expression is false. Conditional expression. If true, executes stat1, else stat2. Simulate a switch structure by using listed if statements within a block with the last statement referencing a label for the block.
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LABEL:{ if(expr){statements;last LABEL}; } Loop Control Structures: while, until, for, foreach LABEL:while( expression ) { statements; } do{ statements; } until( expression ) foreach variable ( list-values) { statements; } for( init-expr; test-expr; incr-expr) { statements; } LABEL: block-or-loop Functions sub function-name ; sub function-name { statements; } & function-name(arg-list) @@_
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while executes statements as long as its test expression is true. LABEL is optional. until executes statements as long as its test expression is false. foreach is designed for use with lists of values such as those generated by an array; the variable operand is consecutively assigned the values in the list. The for control structure executes statements as long as test-expr is true. The first expression, initexpr, is executed before the loop begins. The third expression, incr-expr, is executed within the loop after the statements. Label a block or loop. Used with the next, last, and redo commands. Declare a function. Define a function with the name function-name.
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Call a function with arguments specified in the argument list. Holds the values of arguments passed to the current function. $_ and index references an argument. $_[0] is the first argument. Number of arguments passed to the current function.
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Perl has different sets of operators for numeric and string comparisons. You have to be careful not to mix up the different operators. The string operators are two-letter codes similar to those used in the BASH shell. For example, the eq operator tests for the equality of two strings, and the gt operator tests to see if one is greater than the other. Numeric comparisons, on the other hand, use as operators symbols similar to those found in programming languages. For example, > stands for greater than, and == tests for equality. These are essentially the same comparison operators used for the C programming language. There are two important exceptions: patterns and string patterns. The string-pattern operator, =~, tests for a pattern in a string variable. The right-hand operand is the pattern, and the lefthand operand is the string. The pattern can be any regular expression, making this a very flexible and powerful operation. Patterns perform pattern matching on either a string or the contents of the _$ special variable. The pattern operator consists of two slashes that enclose the pattern searched for, /pattern/. The pattern can be any regular expression. Regular expression are discussed in detail in the section on pattern matching. Perl supports the AND, OR, and NOT logical operations. There are two implementations of these operations: the standard operators and those with list processing capabilities. The standard logical operators are &&, ||, and !. The && operator implements an AND operation, || an OR, and ! a NOT. They take as their operands expressions, just as they do in the C programming language. Their syntax is as follows:
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(expression) && (expression) (expression) || (expression) !(expression)
In the case of the logical AND, &&, if both commands are successful, the logical command is true. For the logical OR, ||, if either command is successful, the OR is true. You can extend these commands with added && or || commands, creating complex AND or OR operations. The logical commands allow you to use logical operations as your test commands in control structures. You can also use them independently. The logical operators are usually used in test expressions for control structures such as while and if. But they can also be used independently as their own statements. In effect, they provide a simple way to write a conditional operation. In Perl scripts, you may often see an OR operation used with a file open command. In an OR operation, if the first expression fails, the second one is checked. If that second one is the die command to end the program, in effect there is an operation to end the program if the file open operation fails (the first expression fails).
open (REPS, "+> $filen") or die "Can't open $filen";
The AND operation works similarly, except that if the first expression is true, the second one is checked. The following looks for an empty line and, if it finds it, prints the message:
/^$/ && print "Found empty line";
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