Hello all, Please see the sequence below:
----------------------\/--------BEGIN---------\/---------------------- 1 % perl -v | grep built This is perl, v5.6.0 built for i686-linux 2 % 2 % perl -wMstrict -le 'print bogus' Unquoted string "bogus" may clash with future reserved word at -e line 1. Name "main::bogus" used only once: possible typo at -e line 1. Filehandle main::bogus never opened at -e line 1. 3 % 3 % perl -wMstrict -le 'print + bogus' Name "main::bogus" used only once: possible typo at -e line 1. Filehandle main::bogus never opened at -e line 1. 4 % 4 % perl -wMstrict -le 'print 0 + bogus' Bareword "bogus" not allowed while "strict subs" in use at -e line 1. Execution of -e aborted due to compilation errors. 5 % 5 % perl -wMstrict -le 'print - bogus' -bogus 6 % 6 % perl -wMstrict -le 'print 0 - bogus' Bareword "bogus" not allowed while "strict subs" in use at -e line 1. Execution of -e aborted due to compilation errors. 7 % 7 % perl -wMstrict -MData::Dumper -le 'print Dumper(- bogus)' $VAR1 = '-bogus'; 8 % 8 % perl -wMstrict -MData::Dumper -le 'print Dumper(+ bogus)' Bareword "bogus" not allowed while "strict subs" in use at -e line 2. Execution of -e aborted due to compilation errors. 9 % 9 % echo $SHELL $version /usr/local/bin/tcsh tcsh 6.10.00 (Astron) 2000-11-19 (i386-intel-linux) \ options 8b,nls,dl,al,kan,rh,color,dspm # I line-wrapped the output here, to fit in 80 columns. 10 % ----------------------/\---------END----------/\---------------------- Why does perl behave differently for the various commands above? I have some specific questions about some of the commands. Command 2: With "-Mstrict", why does perl not flag a bareword error? Command 3: "perldoc perlop" says: > Unary "+" has no effect whatsoever, even on strings. But clearly, in Command 3, it suppresses the "Unquoted string" error message, while it continues to interpret "bogus" as a filehandle. Why is this? Command 5: Why is "- bogus" not treated as a unary minus operation on a bareword? Why does it get stringified and squeezed into "-bogus"? (See Command 7.) TIA. peace, || Udayachal: a newspaper edited by slum children: --{kr.pA} || http://tinyurl.com/57jaf -- This .sig intentionally left blank. _______________________________________________ Boston-pm mailing list [email protected] http://mail.pm.org/mailman/listinfo/boston-pm
