Re: [Win32] Escaping quotes in perl one liner (updated)

~~Some~~ | The CMD MSDOS/Windows command line interpreter (God love it) requires, for some reason, that certain characters like & (there may be others (update: I believe & \ < > ^ | are all the characters that must be carat-escaped between backslash-escaped double-quotes)) that are between escaped double-quotes be escaped with a ^ (carat). Go figure.

Win8 Strawberry 5.8.9.5 (32)  Sat 11/28/2020  2:08:16
C:\@Work\Perl\monks\MikeTaylor
>perl -Mstrict -Mwarnings -le "print \"&\", '\"&\"', '&';"
Can't find string terminator '"' anywhere before EOF at -e line 1.
'\", '\"' is not recognized as an internal or external command,
operable program or batch file.
'\"', '&';"' is not recognized as an internal or external command,
operable program or batch file.

Win8 Strawberry 5.8.9.5 (32)  Sat 11/28/2020  2:08:48
C:\@Work\Perl\monks\MikeTaylor
>perl -Mstrict -Mwarnings -le "print \"^&\", '\"^&\"', '&';"
&"&"&
[download]

Update: Changed example code to provide more instances of ~~printing &~~ | the presence of & inside versus outside escaped double-quotes.

Give a man a fish: <%-{-{-{-<

Comment on Re: [Win32] Escaping quotes in perl one liner (updated) Select or Download Code

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Re^2: [Win32] Escaping quotes in perl one liner by syphilis (Archbishop) on Nov 28, 2020 at 09:07 UTC
that certain characters like & (there may be others) that are between escaped double-quotes be escaped with a ^ (carat). Yes ... that was the bit of information I was missing. I had tried using the stick on the on the `>` and the `&`, to no avail: `C:\_32>perl -Mstrict -MDevel::Peek -le "my $arg = \"\>\&STDOUT\"; Dump + $arg;" The system cannot find the path specified. The system cannot find the path specified.` [download] But using the carrot works fine: `C:\_32>perl -Mstrict -MDevel::Peek -le "my $arg = \"^>^&STDOUT\"; Dump + $arg;" SV = PV(0x2dcd2c) at 0x1c90564 REFCNT = 1 FLAGS = (POK,IsCOW,pPOK) PV = 0x1c8ff64 ">&STDOUT"\0 CUR = 8 LEN = 10 COW_REFCNT = 1` [download] Perhaps when the shell saw a backslash in those contexts, it might have been inclined to think "directory separator", so they had to come up with a different escape symbol. UPDATE: It seems that, even with `q()`and `qq()`, there are still times when the carat needs to be invoked as an escape: C:\_32>perl -Mstrict -MDevel::Peek -le "my $arg = q(">&STDOUT"); Dump +$arg;" >& was unexpected at this time. C:\_32>perl -Mstrict -MDevel::Peek -le "my $arg = q("^>^&STDOUT"); Dum +p $arg;" SV = PV(0x6bcd2c) at 0x57b30c REFCNT = 1 FLAGS = (POK,IsCOW,pPOK) PV = 0x58056c ">&STDOUT"\0 CUR = 8 LEN = 10 COW_REFCNT = 1 C:\_32>perl -Mstrict -MDevel::Peek -le "my $arg = qq(">&STDOUT"); Dump + $arg;" >& was unexpected at this time. C:\_32>perl -Mstrict -MDevel::Peek -le "my $arg = qq("^>^&STDOUT"); Du +mp $arg;" SV = PV(0x6ccd2c) at 0x1e30fe4 REFCNT = 1 FLAGS = (POK,IsCOW,pPOK) PV = 0x1e6f47c ">&STDOUT"\0 CUR = 8 LEN = 10 COW_REFCNT = 1 C:\_32>perl -Mstrict -MDevel::Peek -le "my $arg = q(\">&STDOUT\"); Dum +p $arg;" >& was unexpected at this time. C:\_32>perl -Mstrict -MDevel::Peek -le "my $arg = q(\"^>^&STDOUT\"); D +ump $arg;" SV = PV(0x55cd2c) at 0x650274 REFCNT = 1 FLAGS = (POK,IsCOW,pPOK) PV = 0x690f5c "\">&STDOUT\""\0 CUR = 10 LEN = 12 COW_REFCNT = 1 C:\_32>perl -Mstrict -MDevel::Peek -le "my $arg = qq(\">&STDOUT\"); Du +mp $arg;" >& was unexpected at this time. C:\_32>perl -Mstrict -MDevel::Peek -le "my $arg = qq(\"^>^&STDOUT\"); +Dump $arg; " SV = PV(0x34cd34) at 0x1d8afbc REFCNT = 1 FLAGS = (POK,IsCOW,pPOK) PV = 0x1d905ac "\">&STDOUT\""\0 CUR = 10 LEN = 12 COW_REFCNT = 1 C:\_32> [download] Cheers, Rob	[reply] [d/l] [select]
Re^3: [Win32] Escaping quotes in perl one liner by AnomalousMonk (Archbishop) on Nov 28, 2020 at 09:47 UTC
Perhaps when the shell saw a backslash in those contexts, it might have been inclined to think "directory separator", so they had to come up with a different escape symbol. Ah-ha. Yes, I think you're right! I've wondered about that for a long time. Thank you for dispelling my perplexity. Give a man a fish: `<%-{-{-{-<`	[reply] [d/l]