Call Perl script from Ruby

[Nick Snels]

Hi,

I have a very basic Perl script (calls a nice CPAN library not available
in Ruby) that prints it output to the screen. In Ruby I call it like:

sql = `vendor\\sql\\sql.pl "#{@question.sql}"`

But I get the following error

Errno::ENOEXEC in Question#create
Exec format error - vendor\converters\sql\sql.pl "select * from
cdcol.cds"

When I call it from DOS it works perfectly. How can I fix this? And is
there an alternative for using ` (backquotes)? Thanks for the help.

Kind regards,

Nick

 

[Steve Peters]

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Hi,
=20
I have a very basic Perl script (calls a nice CPAN library not available= =20
in Ruby) that prints it output to the screen. In Ruby I call it like:
=20
sql =3D `vendor\\sql\\sql.pl "#{@question.sql}"`
=20
But I get the following error
=20
Errno::ENOEXEC in Question#create
Exec format error - vendor\converters\sql\sql.pl "select * from=20
cdcol.cds"
=20
When I call it from DOS it works perfectly. How can I fix this? And is=20
there an alternative for using ` (backquotes)? Thanks for the help.
=20

IO.popen is one way to go. Here's a quick example...

ls =3D IO.popen("ls -ltr", "r")
puts ls.readlines

Kernel.exec should be the same as using the backquotes. If you need
something more robust, take a look at Open3.

Steve Peters
(e-mail address removed)

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[Robert Klemme]

Hi,

I have a very basic Perl script (calls a nice CPAN library not
available in Ruby) that prints it output to the screen. In Ruby I
call it like:

sql = `vendor\\sql\\sql.pl "#{@question.sql}"`

But I get the following error

Errno::ENOEXEC in Question#create
Exec format error - vendor\converters\sql\sql.pl "select * from
cdcol.cds"

try this:

sql = `perl vendor\\sql\\sql.pl "#{@question.sql}"`

Regards

robert

 

[Logan Capaldo]

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Kernel.exec should be the same as using the backquotes

Eeek! It is certainly not the same as using backquotes. exec
_replaces_ the currently running process with its argument, he'd
never return to ruby to do additional processing.


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[Nick Snels]

It worked beautifully, thanks Robert. I'm also going to take a look at
popen, I say it used in another program and it looks promising.

Kind regards,

Nick

 

[Rob Pitt]

Slightly OTT, I accidently ran a perl script with:

ruby script.pl

The other day, and it executed fine!!!!

 

[Rob Pitt]

Look at them gem called "session". It's nice for executing processes.

 

[Logan Capaldo]

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Slightly OTT, I accidently ran a perl script with:

ruby script.pl

The other day, and it executed fine!!!!

Was it

print "Hello, world!\n"

?


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