From: Jason Cameron <luxen124012x1@...>
Date: 2006-01-18T14:03:03+09:00
Subject: Re: Looping through files using exec

vrtwo lastname wrote:
> You said bash...
> 
> Does "Done" represent a directory?  and.. does Done\#{filename} work
> with this option? I would have thought that in *nix, it would be
> Done/#{filename}
> 
> Not exactly sure what this app is supposed to do but the loop looks ok..
> 
> irb(main):004:0> puts "mencoder \"" + x + "\" -vf scale=320:240 -ovc
> lavc -lavcopts vcodec=mpeg4:vbitrate=150 -oac mp3lame -lameopts
> vbr=3:br=64 -o \"Done\\" + x + "\""
> mencoder "pron.avi" -vf scale=320:240 -ovc lavc -lavcopts
> vcodec=mpeg4:vbitrate=150 -oac mp3lame -lameopts vbr=3:br=64 -o
> "Done\pron.avi"

If I replace exec with puts it lists the commands fine.  My problem is 
that when I use exec it runs the first command fine then exits ignoring 
all the other files.  For example if I have a directory that has the 
files:

bar1.avi
bar2.avi
bar3.avi

and I use the following in IRB:

Dir["*.avi"].each {|x| puts ("mencoder \"" + x + "\" -vf scale=320:240 
-ovc lavc -lavcopts vcodec=mpeg4:vbitrate=150 -oac mp3lame -lameopts 
vbr=3:br=64 -o \"Done\\" + x + "\"") }

I get the following output:

mencoder "\bar1.avi" -vf scale=320:240 -ovc lavc -lavcopts 
vcodec=mpeg4:vbitrate=150 -oac mp3lame -lameopts vbr=3:br=64 -o 
"Done\bar1.avi"
mencoder "\bar2.avi" -vf scale=320:240 -ovc lavc -lavcopts 
vcodec=mpeg4:vbitrate=150 -oac mp3lame -lameopts vbr=3:br=64 -o 
"Done\bar2.avi"
mencoder "\bar3.avi" -vf scale=320:240 -ovc lavc -lavcopts 
vcodec=mpeg4:vbitrate=150 -oac mp3lame -lameopts vbr=3:br=64 -o 
"Done\bar3.avi"

but if I do:

Dir["*.avi"].each {|x| puts ("mencoder \"" + x + "\" -vf scale=320:240 
-ovc lavc -lavcopts vcodec=mpeg4:vbitrate=150 -oac mp3lame -lameopts 
vbr=3:br=64 -o \"Done\\" + x + "\"") }

It will only execute:
mencoder "\bar1.avi" -vf scale=320:240 -ovc lavc -lavcopts 
vcodec=mpeg4:vbitrate=150 -oac mp3lame -lameopts vbr=3:br=64 -o 
"Done\bar1.avi"


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