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$OS_ERROR
$ERRNO
$!

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$OS_ERROR

$ERRNO

If used in a numeric context, yields the current value of errno, with all the usual caveats. (This means that you shouldn't depend on the value of ``$!'' to be anything in particular unless you've gotten a specific error return indicating a system error.) If used in a string context, yields the corresponding system error string. You can assign to ``$!'' to set errno if, for instance, you want ``$!'' to return the string for error n, or you want to set the exit value for the die() operator. (Mnemonic: What just went bang?)

Source: Perl predefined variables
Copyright: Larry Wall, et al.

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$OS_ERROR $ERRNO $!

$OS_ERROR
$ERRNO
$!