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problem using system() mike 04-09-2008
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Posted by mike on April 9, 2008, 8:42 am
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 Hi,

I have the following string:

my $command = "$User_Preferences deploy --user=
$User_Preferences --passwordfile=
$User_Preferences --host=$User_Preferences --
port=$User_Preferences $User_Preferences";
system($command);

Global symbol "$command" requires explicit package name at
remote_deploy.pl line 55.
syntax error at remote_deploy.pl line 55, at EOF
Missing right curly or square bracket at remote_deploy.pl line 55,
within string
Execution of remote_deploy.pl aborted due to compilation errors.

Any ideas what I need to do to make it possible to execute the
command?

cheers,

//mike

Posted by A. Sinan Unur on April 9, 2008, 9:18 am
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 news:6f8e80dd-1a07-4719-a634-
18f2a21dce0f@s37g2000prg.googlegroups.co
m:

> I have the following string:
>
> my $command = "$User_Preferences deploy
> --user= $User_Preferences --passwordfile=
> $User_Preferences --host=$User_Preferences
> -- port=$User_Preferences
> $User_Preferences"; system($command);

This is a little silly. You do realize that you do not have string,
right? You have

"$User_Preferences{"

followed by the bareword

asadminexecutable

followed by

"} deploy -- ..."

etc.

> Any ideas what I need to do to make it possible to execute the
> command?

I would recommend using a LIST argument with system in this case
(see perldoc -f system) unless you need some features of the shell:

system $User_Preferences,
'deploy',
        "--user=$User_Preferences",
        "--passwordfile=$User_Preferences",
"--host=$User_Preferences",
"--port=$User_Preferences",
"$User_Preferences";

Sinan

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Posted by Joost Diepenmaat on April 9, 2008, 9:21 am
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> Hi,
>
> I have the following string:
>
> my $command = "$User_Preferences deploy --user=
^^ ^^ ^^

> $User_Preferences --passwordfile=
^^ ^^
> $User_Preferences --host=$User_Preferences --
^^ ^^ ^^ ^^
> port=$User_Preferences $User_Preferences";
^^ ^^ ^^ ^^^^

get rid of all the double quotes in the $hash constructs. you
don't need them and they break the double quoted string they're
interpolated in.

--
Joost Diepenmaat | blog: http://joost.zeekat.nl/ | work: http://zeekat.nl/

Posted by mike on April 9, 2008, 9:57 am
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Hi,

I changed it to ( taking all pointers into account):


my @args = ($User_Preferences, 'deploy', "--user=
$User_Preferences","--passwordfile=
$User_Preferences","--host=$User_Preferences","--
port=$User_Preferences","$User_Preferences");

system(@args) == 0 or die "system @args failed: $?"
if ($? == -1) {
print "failed to execute: $!\n";
}
elsif ($? & 127) {
printf "child died with signal %d, %s coredump\n",
($? & 127), ($? & 128) ? 'with' : 'without';
}
else {
printf "child exited with value %d\n", $? >> 8;
}

I get the following error:

Possible unintended interpolation of @args in string at
remote_deploy.pl line 63.
syntax error at remote_deploy.pl line 63, near "system"
Global symbol "@args" requires explicit package name at
remote_deploy.pl line 63.
Global symbol "@args" requires explicit package name at
remote_deploy.pl line 63.
Execution of remote_deploy.pl aborted due to compilation errors.

Does not really help me as a newbie :-)
Any ideas?

cheers,

//mike

Posted by Japhio on April 9, 2008, 10:21 am
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> Hi,
>
> I changed it to ( taking all pointers into account):
>
> my @args = ($User_Preferences, 'deploy', "--user=
> $User_Preferences","--passwordfile=
> $User_Preferences","--host=$User_Preferences","--
> port=$User_Preferences","$User_Preferences");
>
> system(@args) == 0 or die "system @args failed: $?"

[cut]

> Possible unintended interpolation of @args in string at
> remote_deploy.pl line 63.
> syntax error at remote_deploy.pl line 63, near "system"

^^^ Here is the nasty bit!

> Global symbol "@args" requires explicit package name at
> remote_deploy.pl line 63.
> Global symbol "@args" requires explicit package name at
> remote_deploy.pl line 63.
> Execution of remote_deploy.pl aborted due to compilation errors.
>

There is a semicolon ';' missing after the line with system().

By the way, from the error message 'Global symbol "@args" requires
explicit package name' I infer that you use the strict pragma, which
is a good thing. Now learn to interpret the error messages ;-)

> Does not really help me as a newbie :-)
> Any ideas?

Keep on trying!

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