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Re^5: Reading output of external program without Shell

by karlgoethebier (Abbot)
on Nov 16, 2017 at 11:34 UTC ( [id://1203579]=note: print w/replies, xml ) Need Help??


in reply to Re^4: Reading output of external program without Shell
in thread Reading output of external program without Shell

"The code you showed does..."

Ah, right. Thanks for correcting me. A precious hint.

BTW, from the friendly manual:

# Launch a sub process directly, no shell. Can't do redirection # with this form, it's here to behave like system() with an # inverted result. $r = run "cat a b c";

Perhaps i missed something.

"Es ist immer komplizierter" (Ludwig Marcuse)

Still my favorite quote and motto.

Best regards, Karl

«The Crux of the Biscuit is the Apostrophe»

perl -MCrypt::CBC -E 'say Crypt::CBC->new(-key=>'kgb',-cipher=>"Blowfish")->decrypt_hex($ENV{KARL});'Help

Replies are listed 'Best First'.
Re^6: Reading output of external program without Shell
by haukex (Archbishop) on Nov 16, 2017 at 12:09 UTC

    Hm, you're right, it does say that!

    # Call this system's shell, returns TRUE on 0 exit code # THIS IS THE OPPOSITE SENSE OF system()'s RETURN VALUE run "cat a b c" or die "cat returned $?"; # Launch a sub process directly, no shell. Can't do redirection # with this form, it's here to behave like system() with an # inverted result. $r = run "cat a b c";

    I don't see how run would know that it is being called as run() or die vs. $r = run(). Also, I can't get it to work...

    $ perl -wMstrict -MIPC::Run=run -e' my $r = run "pstree -A $$" ' perl---sh---pstree

    Later on the docs say:

    run(), start(), and harness() can all take a harness specification as input. A harness specification is either a single string to be passed to the systems' shell

    And, on the other hand, the IPC::Run docs don't explicitly say that run [...] doesn't use the shell, although in the code you can find exec { $_[0] } @_;. It's all a bit confusing unfortunately.

      "...a bit confusing..."

      Yes. I asked the author. Best regards, Karl

      «The Crux of the Biscuit is the Apostrophe»

      perl -MCrypt::CBC -E 'say Crypt::CBC->new(-key=>'kgb',-cipher=>"Blowfish")->decrypt_hex($ENV{KARL});'Help

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