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# 8  
Old 01-03-2011
In:
Quote:
Originally Posted by radoulov
<snip>
Code:
find $(find . -name '2[0-9][0-9][0-9][01][0-9]' -type d) -type f

you may run into problems if the number of arguments for the outer find exceeds your shell's limits. You can get around that by:
Code:
find . -name '2[0-9][0-9][0-9][01][0-9]' -type d -exec find {} -type f -print \;

Now if you want to get fancy Smilie, taken from an example from xargs:
Code:
find . -name '2[0-9][0-9][0-9][01][0-9]' -type d -print | xargs sh -c 'find "$@" -type f -print'

(xargs is your friend Smilie)
# 9  
Old 01-03-2011
Quote:
Originally Posted by m.d.ludwig
In:
you may run into problems if the number of arguments for the outer find exceeds your shell's limits.
Those are not shell limits, see above Smilie

Quote:
You can get around that by:
Code:
find . -name '2[0-9][0-9][0-9][01][0-9]' -type d -exec find {} -type f -print \;

I would avoid this one because of its inefficiency.

Quote:
Now if you want to get fancy Smilie, taken from an example from xargs:
Code:
find . -name '2[0-9][0-9][0-9][01][0-9]' -type d -print | xargs sh -c ’find "$@" -type f -print'

(xargs is your friend Smilie)
Hm,
I believe you mean:

Code:
find . -name '2[0-9][0-9][0-9][01][0-9]' -type d | 
  xargs -I{} find {} -type f

Or this:

Code:
find . -name '2[0-9][0-9][0-9][01][0-9]' -type d \
  -exec sh -c 'find "$@" -type f' - {} +

Otherwise you'll skip $0.
Last edited by radoulov; 01-03-2011 at 08:40 AM..
This User Gave Thanks to radoulov For This Post:
m.d.ludwig
# 10  
Old 01-03-2011
Quote:
Originally Posted by m69w
This works indeed (with a '.' after the first find though).

May be i'm being picky but isn't just 1 single call to find necessary ?
try
Code:
find -name "2[0-9][0-9][0-9][0,1][0-9]" -type d -print -exec ls -1 {} \;

more try
Code:
find -name "2[0-9][0-9][0-9][0,1][0-9]" -type d -print -exec ls -1 {} \;| sed -e :a -e 'N;s/^\(\..*\)\n\([^\.]*\)/\1 \2/;s/\(\..*\)\(\..*\)/\1\n\2/;ba'|sed '/^$/d;s/ / -> /1'

This User Gave Thanks to ygemici For This Post:
m69w
# 11  
Old 01-03-2011
@radoulov:
Quote:
Originally Posted by radoulov
Those are not shell limits, see above
You are quite correct.

But for:
Quote:
Originally Posted by m.d.ludwig
Code:
find . -name  '2[0-9][0-9][0-9][01][0-9]' -type d -print | xargs sh -c ’find "$@"  -type f -print'

I did not mean:
Quote:
Originally Posted by radoulov
Code:
find . -name '2[0-9][0-9][0-9][01][0-9]' -type d | xargs -I{} find {} -type f

The -I option implies the -L1 option, so this would be functionally equivalent to:
Quote:
Originally Posted by m.d.ludwig
Code:
find . -name  '2[0-9][0-9][0-9][01][0-9]' -type d -exec find {} -type f -print  \;

because as per xargs:
Code:
-L max-lines
    Use at most max-lines nonblank input lines per command line.
    Trailing blanks cause an input line to be logically continued
    on the next input line.  Implies -x.

You are correct about skipping $0, so I'd like to change my answer to:
Code:
find . -name '2[0-9][0-9][0-9][01][0-9]' -type d -print | xargs sh  -c ’find "$@" -type f -print' --

(xargs is still your friend)
This User Gave Thanks to m.d.ludwig For This Post:
radoulov
# 12  
Old 01-03-2011
Quote:
Originally Posted by m.d.ludwig
@radoulov:

You are quite correct.

But for:

I did not mean:

The -I option implies the -L1 option, so this would be functionally equivalent to:
[...]
Didn't know this quite important detail,
thanks for pointing it out!
# 13  
Old 01-03-2011
And thanks for pointing out the "skipping of $0".
# 14  
Old 01-03-2011
From a performance perspective, did some benchmark tests: M.D.Ludwig's solution seems faster.

In the competition was xargs, the filter suggestion from ygemici (using egrep instead of the sed expression), and a while read loop:

1) find . -name '2[0-9][0-9][0-9][01][0-9]' -type d | xargs -I{} find {} -type f
2) find . -name '2[0-9][0-9][0-9][01][0-9]' -type d -print | xargs sh -c 'find "$@" -type f -print' (with incomplete results)
3) find . -name 2[0-9][0-9][0-9][0,1][0-9] -type d|while read d; do find $d -type f; done
4) find . -name "2[0-9][0-9][0-9][0,1][0-9]" -type d -print -exec ls -1 {} \;|egrep -v '^\.'

xargs is the way to go, thanks for the suggestion M.D : )
Last edited by radoulov; 01-03-2011 at 11:23 AM.. Reason: Code tags ...
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