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$now= "Todays date: " . `date`; # sets $now to be the specified label followed by result of shell's date invocation
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`who` would naturally return a set of lines and the result can be stored into an array -- one array entry for each output line
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Both system and backquote mechanism invoke a shell command which normally share standard input, standard output and standard error with the Perl program
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This can be reset as for instance in
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`rm fred 2>&1`; # using shell syntax to send standard error to same place as standard output
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