EXPR is executed as a system command. The collected standard output of the command is returned. In scalar context, it comes back as a single (potentially multi-line) string. In list context, returns a list of lines (however you've defined lines with $/ (or $INPUT_RECORD_SEPARATOR in English)). This is the internal function implementing the qx/EXPR/ operator, but you can use it directly. The qx/EXPR/ operator is discussed in more detail in "qx/STRING/" in perlop. If EXPR is omitted, uses $_.
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