OT -- BASH

[Paul Heinlein <heinlein (at) madboa.com>]

On Thu, 22 Jun 2006, James Pearson wrote:

> Robert wrote:
> >  Can someone explain why this:
> >    find . -depth -print0 | cpio --null -pmd /tmp/test
> >  will copy all files in and below the current directory -and- this:
> >    find . -depth -print | grep -v .iso$ | wc -l
> >  will count all the non-iso files -and- this:
> >    find . -depth -print | grep  .iso$ | wc -l
> >  will count *only* the iso files -but- this:
> >  find . -depth -print0 | grep -v .iso$ | cpio --null -pmd /tmp/test
> >  doesn't copy *anything*?   Any suggestions for a work-around would also be
> >  most welcome.
>
> Because -print0 generates a NULL separated list - so grep will match .iso\0 
> in the string generated by find and hence not output any list for cpio to 
> read ...
>
> One workaround:
>
> find . -depth -print | grep -v .iso$ | cpio -pmd /tmp/test

The -print0 command is typically used when find is passing filenames 
with spaces or other characters that require a shell escape.

If the filenames are all shell-safe, then -print0 is unnecessary. If 
there's a chance that even one name contains a space, however, then 
-print0 is your friend.

-- Paul Heinlein <heinlein (at) madboa.com>
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