[SOLVED] Issue with capturing STDOUT using tar and p7zip

dblt1234 has asked for the wisdom of the Perl Monks concerning the following question:

I'm trying to capture all output from a backup script I'm running as a cronjob. I save all of my backups in tar.7z files but for some reason only the output from 7z is being captured while the output from tar is not:

Specific code:

my $backupcommand = "tar -cvf - ".$directory."/".$seasonYear."*.html|7
+z a -mx9 -si ".$backupdirectory."/".$seasonYear.".tar.7z";
my $result = `$backupcommand 2>&1`;
[download]

The following is the resulting output in the terminal:

user@server:~$ perl dailyscript.pl > testout.txt
tar: Removing leading `/' from member names
/home/user/backupdirectory/2011.html
user@server:~$
[download]

The following is the resulting output in testout.txt:


7-Zip [64] 9.20  Copyright (c) 1999-2010 Igor Pavlov  2010-11-18
p7zip Version 9.20 (locale=en_GB.UTF-8,Utf16=on,HugeFiles=on,4 CPUs)
Creating archive /home/user/backupdirectory/2011.tar.7z

Compressing  [Content]

Everything is Ok
[download]

I also tried the following and got the same result:

my $backupcommand = "tar -cvf - ".$directory."/".$seasonYear."*.html 2
+>&1|7z a -mx9 -si ".$backupdirectory."/".$seasonYear.".tar.7z";
my $result = `$backupcommand 2>&1`;
[download]

Any suggestions on how to capture all of it?

Comment on [SOLVED] Issue with capturing STDOUT using tar and p7zip Select or Download Code

Replies are listed 'Best First'.
Re: Issue with capturing STDOUT using tar and p7zip by Eliya (Vicar) on Mar 16, 2012 at 16:08 UTC
~~Try running~~¹ Run your `$backupcommand` in a subshell and redirect the output in its entirety: ... my $result = `( $backupcommand ) 2>&1`; [download] P.S.: you can interpolate variables into a double-quoted string, which makes it somewhat easier to read: `my $backupcommand = "tar -cvf - $directory/$seasonYear.html \| 7z a -m +x9 -si $backupdirectory/$seasonYear.tar.7z";` [download] ___ ¹ upd:* just tried it myself — works fine.	[reply] [d/l] [select]
Re^2: Issue with capturing STDOUT using tar and p7zip by dblt1234 (Initiate) on Mar 18, 2012 at 20:03 UTC
Worked perfectly, thanks!	[reply]
Re: Issue with capturing STDOUT using tar and p7zip by glasswalk3r (Friar) on Mar 16, 2012 at 15:39 UTC
Give a try to IPC-Cmd. Alceu Rodrigues de Freitas Junior --------------------------------- "You have enemies? Good. That means you've stood up for something, sometime in your life." - Sir Winston Churchill	[reply]