$LAST_SUBMATCH_RESULT
$FORMAT_LINES_PER_PAGE
$OSNAME
$& The string matched by the last successful pattern match (not counting any matches hidden within a BLOCK or
$EUID
$LIST_SEPARATOR
$REAL_USER_ID
$^P The internal variable for debugging support. The meanings of the various bits are subject to change, but currently indicate:
$^A The current value of the write() accumulator
$EXECUTABLE_NAME
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