Re: This is not a pipe

in reply to This is not a pipe

-p '|'
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Comment on Re: This is not a pipe Download Code

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Re^2: This is not a pipe by Tanktalus (Canon) on Mar 12, 2005 at 01:21 UTC
I like it. Although I think you meant: `!-p _` [download]	[reply] [d/l]
Re^3: This is not a pipe by pijll (Beadle) on Mar 12, 2005 at 13:59 UTC
`-p` is a test operator, so your expression is more or less equivalent to a question: "Is _ (=this) not a pipe?". At least in Unix, '\|' is not a valid filename, so `-p '\|'` will always be false: "Is '\|' a pipe? No.". So the ASCII representation of a pipe, '\|', is never a pipe itself, which is exactly what Magritte meant with his painting.	[reply]
Re^4: This is not an illegal filename by ChemBoy (Priest) on Mar 14, 2005 at 05:14 UTC
I've seen this assertion several times now, though the last time was a while ago. It hasn't gotten any more correct in the interim. `$ touch \\| $ file !$ file \\| \|: empty $ ls -l \\| -rw-r--r-- 1 chemboy users 0 Mar 14 00:09 \|` [download] That, for the record, was on Gentoo Linux on a G4, but similar results can be readily obtained on other platforms. If God had meant us to fly, he would never have given us the railroads. --Michael Flanders	[reply] [d/l]
Re^5: This is not an illegal filename by pijll (Beadle) on Mar 14, 2005 at 10:54 UTC
Re^2: This is not a pipe by Zaxo (Archbishop) on Mar 12, 2005 at 08:55 UTC
Or, taking "this" to be $_ as we do, `-p and print, print q m n'est pas une pipem, $/;` (yes, I mean that ;-) After Compline, Zaxo	[reply] [d/l]
Re^3: This is not a pipe by belg4mit (Prior) on Mar 12, 2005 at 12:29 UTC
It's too late now, but if perl had added a special syntax of m!! to indicate a negated match we could use `m!\\|!`. As it is we have a modified form of one of sfink's suggestions: `$_ !~ m/\\|/`. Also, what about? `pipe(STDIN, STDOUT); #Optional: $\|--, print STDOUT "This is not a pipe\n" ne <STDIN>;` [download] `-- I'm not belgian but I play one on TV. On dit que je parle comme un belge aussi.`	[reply] [d/l] [select]

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