problem creating bash loop through svn list output

[Preston Kutzner]

On Nov 25, 2008, at 10:31 AM, Bram Kuijper wrote:

> Hi all,
>
> I hope this question is not too specific for a ubuntu mailing list,  
> but
> it is about simple bash shell scripting. I cannot get bash to properly
> loop through the output of a svn list command, like this:
>
> svnlist=`svn list file:///myrepository/directory`
>
> for i in "$svnlist"; do
> 	echo "$i";
> 	echo "nextline";
> done;

You need to treat $svnlist as an array, as opposed to just a string  
variable.

svnlist=(`svn list file:///myrepository/directory`)

for i in ${svnlist[@]}; do
	echo "$i"
	echo "nextline"
done

You might need to change your $IFS variable (internal field  
separator).  By default it is set to use whitespace as field  
separators.  This is fine if *NONE* of your filenames have spaces in  
them.  To be on the safe side, I would change your script to look like  
this:

OLDIFS="${IFS}"
IFS=$'\x0A'

svnlist=(`svn list file:///myrepository/directory`)

for i in ${svnlist[@]}; do
	echo "$i"
	echo "nextline"
done

IFS="${OLDIFS}"
unset OLDIFS

What output are you attempting to achieve with this script?  As it  
stands it will look something like this:

<filename>
nextline
<filename>
nextline
<filename>
nextline

etc...  where <filename> is a file name from that directory and  
nextline is the literal text "nextline"
>
>
> However, this does not work at all, the variable $svnlist is not
> splitted into separate items, but just passed as a whole list to $i,  
> so
> the output looks like:
>
> file1
> file2
> file2
> nextline
>
> instead of the desired output:
> file1
> nextline
> file2
> nextline
> file3
> nextline
>
>
> Why does bash looping appear to seamlessly work with commands like  
> ls(),
> but does it choke on svn list?
>
> thanks in advance,
>
> Bram kuijper
>
>
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