[ale] SOLUTION Re: Keep space separated values sane in a bash "for" loop?

[James P. Kinney III]

On Mon, 2007-04-09 at 22:00 -0400, Christopher Bergeron wrote:
> Aha!  
> James, I think you've _mostly_ solved my problem.   I used your cmdline 
> (which works), however, it didn't work the way I was applying it:  as an 
> alias!
> 
> For example:
> find . -maxdepth 1 -mindepth 1 -type d | sed 's/\ /\\ /g'|sed 
> 's/.\///'|xargs du -sh     == works perfectly
> 
> however...
> 
> alias diskpie="find . -maxdepth 1 -mindepth 1 -type d | sed 's/\ /\\ 
> /g'|sed 's/.\///'|xargs du -sh"    == does not work

I don't think the alias _can_ work since the output will be a list of
directory names.

Even if you change the find to use the -print0 and drop the sed's for a
-0 xarg, it will _still_ output a list.

If you must use the alias, try:

for mydir in `find . -maxdept 1 -mindepth 1 -print0 -type d | xargs -0 |
sed 's/.\///'`
do
alias diskpie=$mydir
<do more stuff with diskpie>
done

But now that you can iterate over the directories individually, the
alias become a superfluous step.

> 
> I have it feeling it has something to do with escaping the quotes, but 
> I'm surprised that alias mungs the string it runs (actually, I'm not 
> really surprised)...
> 
> Kind regards,
> CB
> 
> 
> 
> 
> 
> 
> James P. Kinney III wrote:
> > On Mon, 2007-04-09 at 18:11 -0400, Christopher Bergeron wrote:
> >   
> >> This solution doesn't work with "du" for some reason.
> >>
> >> #!/bin/bash
> >> oldifs=$IFS
> >> export IFS=","
> >> for i in `ls -m|sed 's/, /,/g'`
> >> do
> >> du -sH \"$i\"
> >> done
> >> export IFS=$oldifs
> >>
> >> It appears its turning all of the elements $i into a single variable.
> >>
> >> This code demonstrates:
> >>
> >> #!/bin/bash
> >> oldifs=$IFS
> >> export IFS=","
> >> for i in `ls -m|sed 's/, /,/g'`
> >> do
> >> echo du -sh \"$i\"
> >> done
> >> export IFS=$oldifs
> >>
> >>
> >> What I'm trying to do is create a script that will do "du -sh" on each 
> >> directory listed in the current directory. This is what I have so far:
> >>
> >> alias diskpie='for i in `\ls -l | grep drwx | tr -s " " | cut -f9 -d " 
> >> "`; do du -sh $i; done'
> >>
> >> It works great unless it encounters a directory with a space in the name.
> >>
> >> Anyone have any other ideas?
> >>
> >>     
> >
> > find . -maxdepth 1 -mindepth 1 -type d | sed 's/\ /\\ /g'|sed 's/.\///'|
> > xargs du -sh
> >
> >   
> >> Kind regards,
> >> Chris
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> Robert Story wrote:
> >>     
> >>> On Fri, 6 Apr 2007 12:18:08 -0400 Robert wrote:
> >>> RS> On Thu, 5 Apr 2007 20:13:06 -0400 aaron wrote:
> >>> RS> A> Here's technique that might help. I whipped this up for dealing with
> >>> RS> A> spaced names common to audio file that I wanted to batch convert
> >>> RS> A> to mp3.  Works with bash on Mac -- should work with Linux bash as
> >>> RS> A> well. The trick was to pipe the file listing to READ from STDIN instead
> >>> RS> A> of letting a FOR loop parse the input:
> >>> RS> 
> >>> RS> This works great for embedded spaces, but not so much for spaces at the
> >>> RS> beginning or end of a file name...
> >>>
> >>>
> >>> I've had this same problem for a while, and have always done manual clean-up.
> >>> After trying these solutions and reading the ls man page, I now have a working
> >>> solution that handles spaces anywhere in the name.
> >>>
> >>> #!/bin/bash
> >>> oldifs=$IFS
> >>> export IFS=","
> >>> for i in `ls -m|sed 's/, /,/g'`
> >>> do
> >>>    echo \"$i\"
> >>> done
> >>> export IFS=$oldifs
> >>>
> >>>
> >>> Of course, the above will break for files with a ',' in them, but I can live
> >>> with that... the paranoid could add an initial ls|grep to check and warn for
> >>> that case...
> >>> _______________________________________________
> >>> Ale mailing list
> >>> Ale at ale.org
> >>> http://www.ale.org/mailman/listinfo/ale
> >>>
> >>>   
> >>>       
> >> _______________________________________________
> >> Ale mailing list
> >> Ale at ale.org
> >> http://www.ale.org/mailman/listinfo/ale
> >>     
> >> ------------------------------------------------------------------------
> >>
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> 
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-- 
James P. Kinney III          
CEO & Director of Engineering 
Local Net Solutions,LLC        
770-493-8244                    
http://www.localnetsolutions.com

GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics)
<jkinney at localnetsolutions.com>
Fingerprint = 3C9E 6366 54FC A3FE BA4D 0659 6190 ADC3 829C 6CA7
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