Re: Re: PIPE problem

I'm not convinced that you are correct: perl -e '$foo="tada;";print "$foo\n"'

Your answer has nothing to do with the | (pipe) causing the error. Whether there is a table to describe or not, does not take away the fact that you can have as many semi-colons inside quotes as you like, Perl will not mind.

[EDIT]
Boy, there I was trying to make things clearer, and I muddy them, sorry.

suekawar, maybe your problem stems from a lack of documentation. I found nowhere on PerlMonks or Perldoc.com that explains how qx works in any simple terms.

perl -e '
> $foo = qx[ echo "Me Graq!" ];
> print "$foo";
> '
Me Graq!
[download]

Try reading http://www.perldoc.com/perl5.8.0/pod/perlop.html#Quote-and-Quote-like-Operators.

VSarkiss, I was trying to put across that for someone confused between system, qq and qx your answer might not be so clear.

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Re: Re: Re: PIPE problem by MarkM (Curate) on Feb 22, 2003 at 17:05 UTC
You are missing a critical point... qx/COMMANDLINE/ or system("COMMANDLINE") invokes /bin/sh with the -c option like so: (on WIN32, this is of course a little different) `execl("/bin/sh", "-c", COMMANDLINE);` [download] The quotes in COMMANDLINE are not being ignored or parsed by Perl. They are being handled by /bin/sh. Notice that at a /bin/sh prompt, if you were to type: `$ echo "Hello World" Hello World` [download] For the original example, the poster was trying to do: `$ SQLCOMMAND; \| sqlplus ...` It should have been: `$ echo "SQLCOMMAND;" \| sqlplus ...` The shell uses the quotes to group arguments. The quotes are not passed through to the command (again, under WIN32, this is a little more convoluted). The original problem posted was two-fold. First, as the initial responder suggested, the poster should have used 'echo "SQLCOMMAND;"' not 'SQLCOMMAND;'. As a later responder suggested, the poster should not be using both qx// and system() as both will execute the command. Either system() should be used if the output does not need to be intercepted, or qx// should be used if the output does need to be intercepted.	[reply] [d/l] [select]
Re: Re: Re: PIPE problem by suekawar (Novice) on Feb 24, 2003 at 15:09 UTC
thanks for the help	[reply]