On Wed, Apr 15, 2009 at 09:20, Rajini Naidu <[email protected]> wrote:
> Hi,
>
> I am trying to execute the below line in the perl program and returns a
> value 0.
>
> my $test2 = "";
> my $include = "file";
>
> $test2 = system("/usr/atria/bin/cleartool desc \$include | grep created |
> awk -F\" \" \'{print \$2}\' | cut -b 1-9 ");
>
> The value returned by $test2 is 0. I suspect grep and awk commands are not
> getting executed.
> Is there any thing wrong in the syntax ????
>
> -Rajini
>
The system[1] function returns 0 on success and a nonzero value
specific to the operating system on failure (often the programs
exit code and the value returned by exec[2]). You could use the
qx// operator[3] to capture the STDOUT of the command:
my $test2 = qx{/usr/atria/bin/cleartool desc \$include |
grep created | awk -F\" \" \'{print \$2}\' | cut -b 1-9};
but a much safer and faster way is to use the open[4] function
and avoid using external programs like grep and awk:
open my $pipe, "-|", "/usr/atria/bin/cleartool", "desc", $include
or die "could not run cleartool: $!";
my @matches;
while (<$pipe>) {
next unless /created/;
my @rec = split;
push @matches, substr $rec[1], 0, 9;
}
Or if you just want the first match:
open my $pipe, "-|", "/usr/atria/bin/cleartool", "desc", $include
or die "could not run cleartool: $!";
my $match;
while (<$pipe>) {
next unless /created/;
my @rec = split;
$match = substr $rec[1], 0, 9;
last;
}
1. http://perldoc.perl.org/functions/system.html
2. http://perldoc.perl.org/functions/exec.html
3. http://perldoc.perl.org/perlop.html#qx/STRING/
4. http://perldoc.perl.org/functions/exec.html
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Chas. Owens
wonkden.net
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