Re: $^O empty in windows powershell

For a full answer:

PS copied many concepts from Bash and Perl. (After all it's an attempt to fix problems with cmd and bat and full of aliases to support *nix commands)

For instance

$ as sigil for $variables
interpolation in double-quoted strings

C:\tmp>powershell
Windows PowerShell
Copyright (C) Microsoft Corporation. Alle Rechte vorbehalten.


PS C:\tmp> $x="xxx"
PS C:\tmp> echo "a${x}b"
axxxb
PS C:\tmp> echo 'a${x}b'
a${x}b
PS C:\tmp> exit

C:\tmp>
[download]

That's why you need a single-quoted string for perl -e

Cheers Rolf
_{(addicted to the 𐍀𐌴𐍂𐌻 Programming Language :)

Wikisyntax for the Monastery}

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Re^2: $^O empty in windows powershell by WithABeard (Sexton) on Nov 22, 2022 at 14:17 UTC
the following code does not output anything: `perl -e 'print "this is a test";'` I can't figure out why, shouldn't this work? this works though: `perl -e 'print qq(this is a test);'`	[reply] [d/l] [select]
Re^3: $^O empty in windows powershell by LanX (Saint) on Nov 22, 2022 at 14:48 UTC
my guess is that doublequotes are stripped from the input `PS C:\Windows\system32> perl -E'say @ARGV' 'say "bla"' say bla PS C:\Windows\system32> perl -E'say @ARGV' 'say qq(bla)' say qq(bla) PS C:\Windows\system32> echo 'say "bla"' say "bla" PS C:\Windows\system32> echo 'print "bla"' \|perl bla PS C:\Windows\system32> echo 'print "bla"' \|perl -E'say <>' print "bla" PS C:\Windows\system32>` [download] this could be an artifact of Perl trying to repair input from CMD ... (?) (I think eyepops will soon come up with an older discussion about the Perl trying to cleverly fix CMD idiosyncrasies ;) Cheers Rolf _{(addicted to the 𐍀𐌴𐍂𐌻 Programming Language :) Wikisyntax for the Monastery}	[reply] [d/l]
Re^4: $^O empty in windows powershell by LanX (Saint) on Nov 22, 2022 at 20:43 UTC
> (I think eyepops will soon come up with an older discussion about the Perl trying to cleverly fix CMD idiosyncrasies ;) well maybe I'm faster, see these threads (Windows) verbatim command line arguments inside Perl script Re^3: Perl Rename There is a lot of voodoo going on to fix CMD input. My guess is that Perl needs to avoid that, if the invoking process is a Powershell. But I'm out of my depth here ... Cheers Rolf _{(addicted to the 𐍀𐌴𐍂𐌻 Programming Language :) Wikisyntax for the Monastery}	[reply]
Re^5: $^O empty in windows powershell by eyepopslikeamosquito (Archbishop) on Nov 22, 2022 at 21:56 UTC
Re^6: $^O empty in windows powershell by LanX (Saint) on Nov 22, 2022 at 22:17 UTC


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