Passing Arguments at the Command Line : Special Variables « Language Basics « Perl

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Perl » Language Basics » Special Variables

Passing Arguments at the Command Line


   



# The @ARGV array holds command-line arguments. 

# If the ARGV filehandle is used, the arguments are treated as files.



#

#$ perlscript filea fileb filec



print "@ARGV\n";  # lists arguments: filea fileb filec

while(<ARGV>){    # filehandle ARGV -- arguments treated as files

   print;         # Print each line of every file listed in @ARGV

}

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16.	ARGV in Perl represents the command-line arguments.
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18.	Alternative names for Perl system variables.
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28.	Catching the sigINT signal
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32.	Extracts information from the $] variable.
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35.	$" is the separator
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37.	$(dollar), is the separator
38.	$MATCH = $&
39.	$SIG{__DIE__}
40.	$SIG{__WARN__} = 'IGNORE';
41.	$SIG{__WARN__} = sub {die "Warning: $_[0]"};
42.	$\ is 'END_OF_OUTPUT'
43.	$^ is the format header
44.	$^O stores the name of the operating system
45.	$^S: is inside eval
46.	$^W: Check the '-w switch'
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55.	If $_contains needle, the string is printed.
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59.	Local builtin var
60.	Locate all numbers less than 6
61.	Manipuate @_ and return @_
62.	Mannually change the $1 variable
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64.	Perl 5 Built-In Variables
65.	Perl's modules reside in the directories named in the @INC array, or subdirectories
66.	Perl's special arrays
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68.	Postmatch $'
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76.	Resetting array base
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81.	System variables that control how write sends output to a file
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83.	The $_ Scalar Variable
84.	The @* field
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117.	foreach loop and $_
118.	or die $!
119.	or die $^E;
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125.	shift: defaults to shifting @ARGV
126.	time - $^T
127.	undef $/;

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