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scalar
$_ the default variable of Perl
Installing and getting started with Perl
Length of an array in Perl
Perl Arrays
Reading from a file in scalar and list context
STDIN in scalar and list context
Scalar and List context in Perl, the size of an array
String functions: length, lc, uc, index, substr
Scalar found where operator expected
Scalar variables
Comparing scalars in Perl
Sets in Perl using Set::Scalar
Scalar values and variables - video
Scalar value constructors
Scalar values
hash in SCALAR context - video
Filehandle in SCALAR and LIST context - video
Perl hash in scalar and list context
Scalar value ... better written as ...