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To use the input that <STDIN> command reads, you assign it to a variable. You can use a variable you define or a default variable called $_, as shown in the next example. $_ is the default for many commands. If the print command has no argument, it will print the value of $_. If the chomp command has no argument, it operates on $_, cutting off the newline. The myread script that follows illustrates the use of $_ with the standard input:
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myread #!/usr/bin/perl # Program to read input from the keyboard and then display it. $_ = <STDIN>; #Read data from the standard input print "This is what I entered: $_"; #Output read data as part of a string $ myread larisa and aleina This is what I entered: larisa and aleina
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You can use the print command to write data to any file or to the standard output. File handle names are placed after the print command and before any data such as strings or variables. If no file handle is specified, print outputs to the standard output. The following examples both write the "hello" string to the standard output. The explicit file handle for the standard output is STDOUT. If you do not specify an argument, print will output whatever was read from the standard input.
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print STDOUT "hello"; print "hello";
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Tip A null file handle, <>, is a special input operation that will read input from a file listed on the command line when the Perl script is invoked. Perl will automatically set up a file handle for it and read. If you list several files on the command line, Perl will read the contents of all of them using the null file handle. You can think of this as a cat operation in which the contents of the listed files are concatenated and then read into the Perl script.
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You use the open command to create a file handle for a file or pipe. The open command takes two arguments: the name of the file handle and the filename string. The name of the file handle is a name you make up. By convention, it is uppercase. The filename string can be the name of the file or a variable that holds the name of the file. This string can also include different modes for opening a file. By default, a file is opened for reading. But you can also
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open a file for writing, or for appending, or for both reading and writing. The syntax for open follows:
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open ( file-handle, filename-string);
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In the next example, the user opens the file reports, calling the file handle for it REPS:
open (REPS, "reports");
Often the filename will be held in a variable. You then use the $ with the variable name to reference the filename. In this example, the filename "reports" is held in the variable filen:
filen = "reports"; open (REPS, $filen );
To open a file in a specific mode such as writing or appending, you include the appropriate mode symbols in the filename string before the filename, separated by a space. The different mode symbols are listed in Table 1. The symbol > opens a file for writing, and +> opens a file for both reading and writing. In the next example, the reports file is opened for both reading and writing:
open (REPS, "+> reports");
Table 1: Perl: File Operations and Command Line Options Perl Command Line Options Description -e -n -p Perl File Commands open(file-handle, permission-withfilename) close(file-handle) filename STDIN Open a file. Close a file. Read from a file. Read from the standard input. Read from files whose filenames are provided in the argument list when the program was invoked. print file-handle text; Write to a file. If no file handle is specified, write to standard output. If no text is specified, write contents of $_. Write formatted string to a file. Use conversion specifiers to format values. If no file handle is specified, write to standard output. If no values are specified, use contents of $_. Write formatted values to a string. Use conversion specifiers to format values. If no values are specified, use contents of $_. Enter one line of a Perl program. Read from files listed on the command line. Output to standard output any data read.
printf handle " Format-str ", values ;
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