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 Forum index » Off-Topic Area » Programming
redirection problems..
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sc0ttman


Joined: 16 Sep 2009
Posts: 2201
Location: UK
PostPosted: Sun 24 Feb 2013, 05:13    Post subject:  redirection problems..
Subject description: bash version incompatibility..?		  
SOLVED: see last post

....


I tried Google.. now here.. I have this code, which works for me in bash-4.2.0:

Code:
cvlc "$FILE" vlc://quit &>>"$LOGFILE" &


The above runs VLC, outputting everything to $LOGFILE, and that is all run in the background, as the script it's inside then moves on to do stuff with the cvlc process..

Anyway... The code does not work (reportedly) in bash 3 .. apparently this does (a space before >>):

Code:
cvlc "$FILE" vlc://quit & >>"$LOGFILE" &


If I change &>> to just >>, then everything works fine, except the actual redirection that I want!

..

The code is loaded from within a func.. That func is not loaded as a background process.. But often that func is itself loaded inside another func which IS run as a background process ... As is, it all works for me..

I tried a few things, until it got messy and things got worse.. Any guidance on what's going on here would be greatly appreciated..

The relevant post is here, and originally reported a posts back from there: http://www.murga-linux.com/puppy/viewtopic.php?p=687378#687378
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Last edited by sc0ttman on Tue 26 Feb 2013, 09:10; edited 1 time in total
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amigo

Joined: 02 Apr 2007
Posts: 1776
PostPosted: Sun 24 Feb 2013, 05:40    Post subject:  
Are you really wanting to *append* to the logfile? If not, then using '&>' would be correct and certainly works with bash-3.x
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sc0ttman


Joined: 16 Sep 2009
Posts: 2201
Location: UK
PostPosted: Sun 24 Feb 2013, 06:39    Post subject:  
I am indeed wanting to append.. But it's not essential.. Before this code I posted, the logfile is created with the actual VLC command and options printed at the top...

I am just hoping to make it work on both BASH versions, as well as I can..

I'd rather not have to have separate bits for different bash versions, so might drop the initial stuff added to the log file, and not append, as you suggest..
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amigo

Joined: 02 Apr 2007
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PostPosted: Sun 24 Feb 2013, 09:28    Post subject:  
I just checked and this works with bash-3.x:
Code:
cvlc "$FILE" vlc://quit 2>&1 1>>"$LOGFILE" &
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sc0ttman


Joined: 16 Sep 2009
Posts: 2201
Location: UK
PostPosted: Sun 24 Feb 2013, 12:55    Post subject:  
amigo wrote:
I just checked and this works with bash-3.x:
Code:
cvlc "$FILE" vlc://quit 2>&1 1>>"$LOGFILE" &

But it breaks the actual logging - with the above code, nothing is added to the logfile (in bash4 at least) .. I need logging to work for both bash 3 and bash 4..
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amigo

Joined: 02 Apr 2007
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PostPosted: Sun 24 Feb 2013, 13:00    Post subject:  
Try this:
Code:
cvlc "$FILE" vlc://quit 2>&1 |tee "$LOGFILE" &
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sc0ttman


Joined: 16 Sep 2009
Posts: 2201
Location: UK
PostPosted: Mon 25 Feb 2013, 08:52    Post subject:  
amigo wrote:
Try this:
Code:
cvlc "$FILE" vlc://quit 2>&1 |tee "$LOGFILE" &

Thanks again for the suggestion amigo.. Unfortunately, while this does fix the logging (somewhat, not including the first part, but thats fine..) but it breaks vlc-gtk, so that all cvlc processes go AWOL, and cannot be stopped, next'd, prev'd, etc.. they all play over each other, not replacing each other as before..

Damn, this is harder than I thought (I've also been trying my own stuff as well obv).. I might have to re-think how vlc-gtk all gets to that cvlc cmd in the first place, or get a totally new method of logging... I hope not..
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amigo

Joined: 02 Apr 2007
Posts: 1776
PostPosted: Mon 25 Feb 2013, 13:22    Post subject:  
Is vlc-gtk a gtkdialog app, by chance?? If so, it should be no surprise that things go weird at times. Back up and try another tactic, if so. Or, maybe it needed to be backgrounded this way:
Code:
cvlc "$FILE" vlc://quit 2>&1 & |tee "$LOGFILE"
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technosaurus


Joined: 18 May 2008
Posts: 3845
PostPosted: Mon 25 Feb 2013, 20:36    Post subject:  
I've been meaning to patch gtkdialog to use the more portable async gio wrappers for popen. If there is any way you could boil it down to a simplified version, I'll take a look at it.
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sc0ttman


Joined: 16 Sep 2009
Posts: 2201
Location: UK
PostPosted: Tue 26 Feb 2013, 09:10    Post subject:  
SOLVED!

This is what works for me, using 2>>$LOGIFLE, not 1>> ...

Code:
cvlc "$FILE" vlc://quit 2>&1 2>>"$LOGFILE" &


The above code works in bash 3 and 4.. Thanks amigo!! Very Happy
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