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Groups > comp.os.linux.misc > #1716

Re: calling script function on output of find

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On Tue, 05 Jul 2011 19:17:29 +0100, Dave Gibson wrote:

> find "$SOURCE_DIR" -type f -size +0 | while IFS= read -r f ; do
>   process_file "$f"
> done

OK. That works.
But I don't like cargo-cult coding so let me see if I understand it.

RTFM-ing (man bash) tells me "One line is read ... and the first word is 
assigned to the first name, the second word to the second name, and so 
on..." and "The characters in IFS  are used to split the line into words."

Also "If the value of IFS  is null, no word splitting occurs."

So by setting IFS= (to null) before calling 'read' we should get the 
output of find split line-by-line e.g.
  dir one/file a
  dir one/file b
  dir two/file z
etc
which 'read' then assigns, one at a time (in the while loop), to the 
variable named 'f' which then gets passed (quoted to avoid splitting) to 
'process_file "$f"'.

Neat.

One question: why the -r switch ("Backslash does not act as an escape 
character") to read?

-- 
John Stumbles

Science doesn’t understand everything.
Religion doesn’t understand anything.

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Thread

calling script function on output of find John Stumbles <john.stumbles@ntlworld.com> - 2011-07-05 10:01 +0000
  Re: calling script function on output of find Joe Makowiec <makowiec@invalid.invalid> - 2011-07-05 10:20 +0000
    Re: calling script function on output of find John Stumbles <john.stumbles@ntlworld.com> - 2011-07-09 12:04 +0000
  Re: calling script function on output of find dave.gma+news002@googlemail.com.invalid (Dave Gibson) - 2011-07-05 19:17 +0100
    Re: calling script function on output of find unruh <unruh@wormhole.physics.ubc.ca> - 2011-07-05 20:01 +0000
      Re: calling script function on output of find John Stumbles <john.stumbles@ntlworld.com> - 2011-07-09 12:21 +0000
        Re: calling script function on output of find Bill Marcum <bill@lat.localnet> - 2011-07-12 19:43 -0400
          Re: calling script function on output of find John Stumbles <john.stumbles@ntlworld.com> - 2011-07-16 00:26 +0000
    Re: calling script function on output of find John Stumbles <john.stumbles@ntlworld.com> - 2011-07-09 12:48 +0000
      Re: calling script function on output of find dave.gma+news002@googlemail.com.invalid (Dave Gibson) - 2011-07-09 19:52 +0100
  Re: calling script function on output of find Chris Davies <chris-usenet@roaima.co.uk> - 2011-07-07 09:37 +0100
    Re: calling script function on output of find John Stumbles <john.stumbles@ntlworld.com> - 2011-07-08 10:02 +0000
      Re: calling script function on output of find Chris Davies <chris-usenet@roaima.co.uk> - 2011-07-08 16:48 +0100
        Re: calling script function on output of find unruh <unruh@wormhole.physics.ubc.ca> - 2011-07-08 17:46 +0000
          Re: calling script function on output of find Chris Davies <chris-usenet@roaima.co.uk> - 2011-07-08 20:56 +0100
            Re: calling script function on output of find unruh <unruh@wormhole.physics.ubc.ca> - 2011-07-08 21:14 +0000
              Re: calling script function on output of find Chris Davies <chris-usenet@roaima.co.uk> - 2011-07-09 11:17 +0100
        Re: calling script function on output of find John Stumbles <john.stumbles@ntlworld.com> - 2011-07-09 12:51 +0000
          Re: calling script function on output of find Chris Davies <chris-usenet@roaima.co.uk> - 2011-07-10 10:45 +0100
            Re: calling script function on output of find John Stumbles <john.stumbles@ntlworld.com> - 2011-07-10 23:14 +0000

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