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42 lines
3.4 KiB
Perl
42 lines
3.4 KiB
Perl
English module helps you to deal with the confusing variable names, like $^X and $'.
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English module associates the odd-named variables with something more understandable.
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Variable English Usage
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$^A $ACCUMULATOR Current value of write accumulator for format data.
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$_ $ARG Default input and pattern-searching variable.
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$^T $BASETIME Time script began running in time format.
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$? $CHILD_ERROR Status returned by last pipe close or system function.
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$^D $DEBUGGING Current value of Perl's debugging flags.
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$) $EFFECTIVE_GROUP_ID Effective group ID for the Perl process.
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$> $EFFECTIVE_USER_ID Effective user ID of process.
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$^X $EXECUTABLE_NAME Name of Perl binary executable file
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$! $ERRNO If numeric context, holds errno result of math function; if string context, holds error message. Also $OS_ERROR.
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$@ $EVAL_ERROR Error message from last eval call.
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$^E $EXTENDED_OS_ERROR Extended error on various operating systems. On Windows, holds the last error from the Win32 GetLastError() call.
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$^L $FORMAT_FORMFEED Output to advance a page from write.
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$: $FORMAT_LINE_BREAK_CHARACTERS Characters allowed to break on when filling continuation fields in a format.
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$- $FORMAT_LINES_LEFT Number of lines left on current page.
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$= $FORMAT_LINES_PER_PAGE Total number of lines available on page.
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$~ $FORMAT_NAME Name of current format.
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$% $FORMAT_PAGE_NUMBER Page number in current format.
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$^ $FORMAT_TOP_NAME Name of top-of-page format.
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$. $INPUT_LINE_NUMBER Line number in the last file handle that was read.
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$/ $INPUT_RECORD_SEPARATOR Ends a line of text for input, newline on UNIX, carriage return and newline on Windows.
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$+ $LAST_PAREN_MATCH Last bracket matched by last search.
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$& $MATCH String matched by last match.
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$# $OFMT Output format for numbers printed with print (not using the format command described in Chapter 5). Normally %.20g.
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$^O $OSNAME Operating system name.
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$| $OUTPUT_AUTOFLUSH If non-zero forces a flush with each write or print.
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$, $OUTPUT_FIELD_SEPARATOR Output field separator.
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$\ $OUTPUT_RECORD_SEPARATOR Output record separator, equivalent of $/ for output.
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$^V $PERL_VERSION String printed by perl -v; version number.
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$' $POSTMATCH String following last match.
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$` $PREMATCH String preceding last match.
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$$ $PROCESS_ID The process ID for this script. Also $PID.
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$0 $PROGRAM_NAME Name of current Perl script (zero, not oh).
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$( $REAL_GROUP_ID Group ID for the Perl process.
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$< $REAL_USER_ID Real user ID.
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$; $SUBSCRIPT_SEPARATOR Subscript separator for multi-dimensional arrays.
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$^F $SYSTEM_FD_MAX Maximum system file descriptor.
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$^W $WARNING True if warning is turned on (by perl -w); false otherwise.
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