! Aware to Perl: $EXTENDED_OS

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$EXTENDED_OS_ERROR
$^E

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$EXTENDED_OS_ERROR

$^E

More specific information about the last system error than that provided by $!, if available. (If not, it's just $! again, except under OS/2.) At the moment, this differs from $! under only VMS and OS/2, where it provides the VMS status value from the last system error, and OS/2 error code of the last call to OS/2 API which was not directed via CRT. The caveats mentioned in the description of $! apply here, too. (Mnemonic: Extra error explanation.)

Note that under OS/2 $! and $^E do not track each other, so if an OS/2-specific call is performed, you may need to check both.

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

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$EXTENDED_OS_ERROR $^E

$EXTENDED_OS_ERROR
$^E