How-To question for the NC*SA brain trust...

[Lance A. Brown]

You are most correct.  I must be dredging up behaviour from some old
weird unix box or something...

I've been way wrong before. :-)

--[Lance]

On Tue, 2004-03-16 at 18:45, John Strickler wrote:
> I just tried with HP-UX v11 sh (Posix, not Bourne), and it also works great.
> 
> To wit, I created the following file:
> 
> -----------listfile---------------
> apple pie
> cherry tart
> apple brown betty
> --------------------------------
> then executed
>     while read x
>     do
>          touch "$x"
>     done < listfile
> 
> this created the 3 files "apple pie", "cherry tart", and "apple brown betty", complete with spaces
> 
> then I executed
> 
>     while read x
>     do
>         chmod 777 "$x"
>     done < listfile
> 
> and it changed the 3 files. It does not break when there are spaces in the file names. 
> 
> -----Original Message-----
> From: "Lance A. Brown" <brown9 at niehs.nih.gov>
> Sent: Mar 16, 2004 6:29 PM
> To: John Strickler <jstrick at mindspring.com>, 
> 	NC*SA Discussion List <ncsa-discussion at ncsysadmin.org>
> Subject: Re: How-To question for the NC*SA brain trust...
> 
> On Tue, 2004-03-16 at 17:11, John Strickler wrote:
> > Another simple approach is to use the shell's (bash or ksh) *read* command and put quotes around the variable
> > 
> > while read $x
> > do
> >      chmod o-w "$x"
> > done < list
> > 
> > This performs one chmod per file, unlike the xargs-type solutions, but has the advantage of being very tidy
> 
> This breaks when there are spaces in the file names, as we have here. 
> The read command will pull apart each input line at the space and return
> the chunks.
> 
> You would want to play with IFS (in sh style shells) if you want this
> syntax so the separator doesn't include spaces.
> 
> --[Lance]
> 
> > 
> > -----Original Message-----
> > From: "Lance A. Brown" <brown9 at niehs.nih.gov>
> > Sent: Mar 16, 2004 4:47 PM
> > To: NC*SA Discussion List <ncsa-discussion at ncsysadmin.org>
> > Subject: Re: How-To question for the NC*SA brain trust...
> > 
> > What about something like:
> > 
> > cat $list | sed -e 's/^/"/' -e 's/$/"/' | xargs chmod o-w
> > 
> > This results in fewer chmod commands being executed.
> > 
> > I often use that sed statement while doing finds and whatnot in
> > directory spaces in samba shares, etc.
> > 
> > --[Lance]
-- 
Lance A. Brown
SysAdmin Task
LMIT ITSS Contract for 
National Institute of Environmental Health Sciences
919.361.5444x420