Re: [Help-bash] Getting rid of white space with % and %%

[Eric Blake]

On 05/21/2012 03:17 PM, Bill Gradwohl wrote:
> I noticed it's apparently legit to say the following:
> 
> string='hello this  is   a    test     '
> echo "'${string}'" original
> 
> echo "'${string%[[:space:]]}'"
> echo "'${string%[[:space:]]*}'"
> echo "'${string%%[[:space:]]*}'"
> 
> Produces:
> address@hidden ycc# ./tst
> 'hello this  is   a    test     ' original
> 'hello this  is   a    test    '
> 'hello this  is   a    test    '
> 'hello'
> 
> I tried it with a tab character at the end of the string and that also
> works.
> 
> Is there any syntactically correct way to provide an * or + multiplier on
> to this to get rid of all the white space at the end of a line?

$ echo "'${string%${string##*[^[:space:]]}}'"

-- 
Eric Blake   address@hidden    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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