Best way to capture output from system command to a text file?

Best way to capture output from system command to a text file?

I?m trying to capture output from using Perl?s system function to execute and redirect a system command?s ouptut to a file, but for some reason I?m not getting the whole output.

I?m using the following method:

system("example.exe >output.txt");  

What?s wrong with this code, or is there an alternative way of doing the same thing?

Answer by Frank Schmitt for Best way to capture output from system command to a text file?

Redirecting the output with plain > will only catch STDOUT. If you also want to catch STDERR, use 2>&1:

perl -e 'system("dir blablubblelel.txt >out.txt 2>&1");'   

For more details, see Perlmonks

Answer by MVS for Best way to capture output from system command to a text file?

You could also try having Perl capture the output instead:

open(FILE, ">output.txt") or die "Could not open file: $!";  print FILE `example.exe`;  close(FILE);  

Answer by Joel Berger for Best way to capture output from system command to a text file?

Same as MVS's answer, but modern and safe.

use strict;  use warnings;    open (my $file, '>', 'output.txt') or die "Could not open file: $!";  my $output = `example.exe`;   die "$!" if $?;   print $file $output;  

easier

use strict;  use warnings;    use autodie;    open (my $file, '>', 'output.txt');  print $file `example.exe`;  

if you need both STDOUT and STDERR

use strict;  use warnings;    use autodie;  use Capture::Tiny 'capture_merged';    open (my $file, '>', 'output.txt');  print $file capture_merged { system('example.exe') };  

Answer by Znik for Best way to capture output from system command to a text file?

When you want recirect output permanently, you can do:

#redirect STDOUT before calling other functions  open STDOUT,'>','outputfile.txt' or die "can't open output";  system('ls;df -h;echo something');  #all will be redirected.  

Answer by Francisco Zarabozo for Best way to capture output from system command to a text file?

I find this way a very nice way to do it:

use warnings;  use strict;  use Capture::Tiny::Extended 'capture';    my ($out, $err, $ret) = capture {      system 'example.exe';  };  $ret = $ret >> 8;    print "OUT: $out\n";  print "ERR: $err\n";  print "RET: $ret\n";  

Thanks DWGuru for commenting on Capture::Tiny::Extended. :-)

Answer by Anil Kongovi for Best way to capture output from system command to a text file?

This works:

In C code, you could have the below line to capture the required output:

system("example.exe > \"output.txt\"");  

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