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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 variables
Scalar found where operator expected
Comparing scalars in Perl
Perl hash in scalar and list context
Scalar value ... better written as ...
Sets in Perl using Set::Scalar
Filehandle in SCALAR and LIST context - video
Scalar values and variables - video
hash in SCALAR context - video
Scalar values
Scalar value constructors