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Table 1: Perl: File Operations and Command Line Options Perl Command Line Options Description filename filename + filename filename command | | command Read-only. Write-only. Read and write. Append (written data is added to the end of the file). An input pipe, reading data from a pipe. An output pipe, sending data out through this pipe.
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If you are using a variable to hold the filename, you can include the evaluated variable within the filename string, as shown here:
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open (REPS, "+> $filen");
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To read from a file using that file's file handle, you simply place the file handle within the < and > symbols. <REPS> reads a line of input from the reports file. In the myreport program, the reports file is opened and its contents are displayed. myreport.pl
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#!/usr/bin/perl # Program to read lines from the reports file and display them open(REPS, "< while ( $ldat { print $ldat; } close REPS; # reports"); # Open reports file for reading only = <REPS> ) # Read a line from the reports file # Display recently read line Close file
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Perl also has a full set of built-in commands for handling directories. They operate much like the file functions. The opendir command opens a directory, much as a file is opened. A directory handle is assigned to the directory. The readdir command will read the first item in the directory, though, when in a list context, it will return all the file and directory names in that directory. closedir closes the directory, chdir changes directories, mkdir creates directories, and rmdir removes directories.
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Perl variables can be numeric or string variables. Their type is determined by context the way they are used. You do not have to declare them. A variable that is assigned a numeric value and is used in arithmetic operations is a numeric variable. All others are treated as strings. To reference a variable in your program, you precede it with a $ symbol, just as you would for a shell variable.
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You can use the same set of operators with Perl variables as with C variables with the exception of strings. Strings use the same special comparison terms as used in the Bourne shell, not the standard comparison operators. Those are reserved for numeric variables. However, other operators such as assignment operators work on both string and numeric variables. In the next example, the variable myname is assigned the string "Larisa". The assignment operator is the = symbol (see Table 2).
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$myname = "Larisa";
For a numeric variable, you can assign a number. This can be either an integer or a floatingpoint value. Perl treats all floating-point values as double precision.
$mynum = 45; $price = 54.72;
Perl also supports arithmetic expressions. All the standard arithmetic operators found in other programming languages are used in Perl. Expressions can be nested using parentheses (see Table 2). Operands can be numeric constants, numeric variables, or other numeric expressions. In the following examples, $mynum is assigned the result of an addition expression. Its value is then used in a complex arithmetic expression whose result is assigned to $price.
$mynum = 3 + 6; $price = ( 5 * ($num / 3);
Table 2: Arithmetic: , Relational (Numeric), and Assignment Operators Arithmetic Operators Function * / + % ** Relational Operators Greater than Less than = = == != Increment Operators ++ Arithmetic Assignment Operators += Increment by specified value Increment variable by one Decrement variable by one Greater than or equal to Less than or equal to Equal in let Not equal Multiplication Division Addition Subtraction Modulo results in the remainder of a division Power
Table 2: Arithmetic: , Relational (Numeric), and Assignment Operators Arithmetic Operators Function -= /= *= %= Decrement by specified value Variable is equal to itself divided by value Variable is equal to itself multiplied by value Variable is equal to itself remaindered by value
Perl supports the full range of assignment operators found in Gawk and C. The ++ and operators will increment or decrement a variable. The += and -= operators and their variations will perform the equivalent of updating a variable. For example, i++ is the same as i = i + 1, and i += 5 is the same as i= i + 5. Increment operations such as i++ are used extensively with loops. You can easily include the value of a variable within a string by simply placing the variable within it. In the following example, the value of $nameinfo would be the string "My name is Larisa \n":
print "The number of items is $mynum \n" $nameinfo = "My name is $myname \n"
To assign data read from a file to a variable, just assign the result of the read operation to the variable. In the next example, data read from the standard input is assigned to the variable $mydata:
$mydata = <STDIN>;
When reading data from the standard input into a variable, the carriage return character will be included with the input string. You may not want to have this carriage return remain a part of the value of the variable. To remove it, you can use the chomp command, which removes the last character of any string. With data input from the keyboard, this happens to be the carriage return.
chomp $myinput;
In the next example, the user inputs his or her name. It is assigned to the myname variable. The contents of myname is then output as part of a string. chomp is used to remove the carriage return from the end of the $myname string before it is used as part of another string.
readname.pl #!/usr/bin/perl $myname = <STDIN>; chomp $myname; print "$myname just ran this program\n"; $ myread.pl larisa Petersen larisa Petersen just ran this program
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