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Old 02-29-2008, 07:54 AM   #1
jukebox55
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listing folders recursivley


hello,

can anyone help with a problem im having. im trying to list all files of type .png on my system, but i cant seem to do it.

i thought this command would work, but it seems it does not
Code:
ls -R /*png
 
Old 02-29-2008, 07:59 AM   #2
druuna
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Hi,

In cases like this I tend to use the find command.

find . -type f -name "*png" should do the trick

This looks from the current dir (the dot ) for files (-type f) that end with png (-name "*png").

Hope this helps.
 
Old 02-29-2008, 08:24 AM   #3
pixellany
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ls -R will list recursively, beginning at the current directory

ls -R /dirname does the same thing, starting in /dirname---thus your command tries to find a directory at the root level whose name ends in png.

The find command will give you the location of the files. You can also do ls -R <dirname>|grep png. This will find all files (and folders) with png in the name.
 
Old 02-29-2008, 08:38 AM   #4
druuna
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Hi,

2 additions to pixellany's post:

1) The ls -R part works (recursive listing). ls -R *pnd doesn't work because the shell first expands *png and gives the output to ls -R.

2) ls -R | grep png has one (possible) drawback: It will only list the file names, not the dir(s) they reside in. If the path is also needed use find, otherwise use ls -R | grep "*png"
 
Old 02-29-2008, 09:06 AM   #5
jukebox55
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interesting, thanks for that information. i used

Code:
find / -name *png
now can i ask for further help, i would like to cp those .png files that were found, into a directory in my home folder, i tried this

Code:
find / -name *png | cp /home/user/foundpngdir
but that wouldnt work, so i tried this

Code:
cp /home/user/foundpngdir $(find / -name *png)
but this gives me this error

Quote:
cp:target 'found.png' is not a directory
 
Old 02-29-2008, 09:11 AM   #6
druuna
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Hi,

find / -type f -name "*png" -exec cp {} ~ \;

This will look for *png files, starting at the root dir. This part you probably recognized.
The -exec part copies all that is found (represented by the {} to your homedir (I'm lazy, so I used ~, /home/user/ is also allowed). The \; at the end is needed to close/end the commdn.

Hope this helps.
 
Old 02-29-2008, 09:37 AM   #7
jukebox55
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yes this works, thanks

Quote:
Originally Posted by druuna View Post

find / -type f -name "*png" -exec cp {} ~ \;
out of interest, is '-exec' an option to the find command? and why does the *png need to be double quoted?
 
Old 02-29-2008, 10:49 AM   #8
druuna
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Hi,

-exec .... \; is indeed one of the many options that can be used with find. It makes it possible to use other linux/unix commands within the find command.

About the quotes. Officially you need to use quotes (single or double, whatever you need) and I always use them. This is also true for other commands. I have to admit that most of the time the commands will work if you don't use the quotes, but it is 'good style' to use them

Hope this clears things up a bit.
 
Old 02-29-2008, 11:13 AM   #9
jukebox55
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yes, its interesting, thankyou
 
  


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