Re: Question about "find -exec"

Re: Question about "find -exec"

[James Mohr]

On Thursday 25 July 2002 01:26, mailing-lists@xs4all.nl wrote:
> Hello,.....
>
> On Wed, 24 Jul 2002, James Mohr wrote:
> > On Wednesday 24 July 2002 09:07, Mike Castle wrote:
> > > In article <200207190752.38161.linux-newbie@jimmo.com>,
> > >
> > > James Mohr  <linux-newbie@jimmo.com> wrote:
> > > >You need to tell -exec which file to process. This is done with curly
> > > > braces:
> > > >
> > > >find /mnt/c/ -name *.snm -exec ls {} \;
> > > >
> > > >However, without the -exec, your command will simply list the files
> > > > anyway. I am assuming that this is just an example, and you would
> > > > want to do more than just list the file name. You could exand this
> > > > concept and use the curly
> > >
> > > Also, you should realize that for each file processed, there is the
> > > overhead of fork()/exec() calls.
> > >
> > > You would probably find something like:
> > >
> > > find /mnt/c -name '*.snm' | xargs -r ls -l
>
> Why preform an extra call to `xargs' if you can use the `-printf format'
> or `-ls' option with `find'? e.g
>     (find /mnt/c -name -regex ".*\.snm" -ls),
>     (find /mnt/c -name -regex ".*\.snm" -printf "%f %b\n")

You wouldn't. At least I wouldn't. As I said in my original answer:

"I am assuming that this is just an example, and you would want to do more 
than just list the file name."

I was simply trying to answer the question why the command was not working as 
expected and provide additional information on the use of find -exec. Mike 
was trying to explain why the find -exec is not always the best solution. I 
don't think either of us would use either of these just to list the file 
names.  

Actually, I often use ls -lR or just ls -R and pipe to grep looking for files. 
I don't think either way is intrinsically "better" (at least not in an 
absolute sense). 

Regards,

jimmo
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RE: Question about "find -exec"

[Petras, Martin [Ontario]]

try

find /mnt/c -name "*.snm" -ls

or with exec

find /mnt/c -name "*.snm" -exec ls -l {} \;

-----Original Message-----
From: Oliver Ob [mailto:ob_ok@gmx.net]
Sent: Thursday, July 18, 2002 11:24 AM
To: Lx Newbie List
Subject: Question about "find -exec"


I want to find and list all files with *.snm ending.
find /mnt/c/ -name *.snm -exec ls
does not work, the man page does tell me french fries.

What am I missing?

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Question about "find -exec"

[Oliver Ob]

I want to find and list all files with *.snm ending.
find /mnt/c/ -name *.snm -exec ls
does not work, the man page does tell me french fries.

What am I missing?

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Re: Question about "find -exec"

[James Mohr]

On Thursday 18 July 2002 17:24, Oliver Ob wrote:
> I want to find and list all files with *.snm ending.
> find /mnt/c/ -name *.snm -exec ls
> does not work, the man page does tell me french fries.
>
> What am I missing?

You need to tell -exec which file to process. This is done with curly braces:

find /mnt/c/ -name *.snm -exec ls {} \;

However, without the -exec, your command will simply list the files anyway. I 
am assuming that this is just an example, and you would want to do more than 
just list the file name. You could exand this concept and use the curly 
braces anywhere in the command. So, to move the files you find to another 
directory you might have this:

find /mnt/c/ -name *.snm -exec mv {} /somewhere/else \;

Note that the \; tells the -exec that you are at the end of the command. For 
details on using find with other commands, check this out:

http://www.linux-tutorial.info/cgi-bin/display.pl?32&0&0&0&3

Regards,

jimmo
-- 

---------------------------------------
"Be more concerned with your character than with your reputation. Your
character is what you really are while your reputation is merely what others
thing you are." -- John Wooden
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Re: Question about "find -exec"

[Mike Castle]

In article <200207190752.38161.linux-newbie@jimmo.com>,
James Mohr  <linux-newbie@jimmo.com> wrote:
>You need to tell -exec which file to process. This is done with curly braces:
>
>find /mnt/c/ -name *.snm -exec ls {} \;
>
>However, without the -exec, your command will simply list the files anyway. I 
>am assuming that this is just an example, and you would want to do more than 
>just list the file name. You could exand this concept and use the curly 

Also, you should realize that for each file processed, there is the
overhead of fork()/exec() calls.

You would probably find something like:

find /mnt/c -name '*.snm' | xargs -r ls -l 

to be significantly faster.

If you expect that there will be any spaces involved, consider using
-print0/-0 in addition:

find /mnt/c -name '*.snm' -print0 | xargs -0 -r ls -l 

mrc
-- 
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Re: Question about "find -exec"

[James Mohr]

On Wednesday 24 July 2002 09:07, Mike Castle wrote:
> In article <200207190752.38161.linux-newbie@jimmo.com>,
>
> James Mohr  <linux-newbie@jimmo.com> wrote:
> >You need to tell -exec which file to process. This is done with curly
> > braces:
> >
> >find /mnt/c/ -name *.snm -exec ls {} \;
> >
> >However, without the -exec, your command will simply list the files
> > anyway. I am assuming that this is just an example, and you would want to
> > do more than just list the file name. You could exand this concept and
> > use the curly
>
> Also, you should realize that for each file processed, there is the
> overhead of fork()/exec() calls.
>
> You would probably find something like:
>
> find /mnt/c -name '*.snm' | xargs -r ls -l
>
> to be significantly faster.
>
> If you expect that there will be any spaces involved, consider using
> -print0/-0 in addition:
>
> find /mnt/c -name '*.snm' -print0 | xargs -0 -r ls -l
>
> mrc

Valid point. However, I typically don't find it an issue unless you are 
running the -exec on 10K files. If it takes 0.1 second with xargs and 1 
second with -exec (which is 10 times as long), I don't see it is worth 
arguing about. 

However, it is **definately** worth mentioning and I have made a note to add 
it to my Linux Tutorial.

Regards,

jimmo

-- 

---------------------------------------
"Be more concerned with your character than with your reputation. Your
character is what you really are while your reputation is merely what others
thing you are." -- John Wooden
---------------------------------------
Be sure to visit the Linux Tutorial:  http://www.linux-tutorial.info
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Re: Question about "find -exec"

[szonyi calin]

 --- Oliver Ob <ob_ok@gmx.net> a écrit : > I want to
find and list all files with *.snm ending.
> find /mnt/c/ -name *.snm -exec ls
> does not work, the man page does tell me french
> fries.
> 
> What am I missing?
> 

try
find /mnt/c/ -name *.snm -exec ls \; -print

(No warranty that it will work :-)) )

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