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what's wrong with my -exec in find

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Top Forums Shell Programming and Scripting what's wrong with my -exec in find
# 1  
Old 07-14-2012
what's wrong with my -exec in find
Code:
find ./ -name *Kconfig -exec cat {}  \;

but it won't work with

Code:
find ./ -name *Kconfig -exec cat {} |grep CONFIG_MTD |grep depend \;

how could I handle this
# 2  
Old 07-14-2012
-exec doesn't involve the shell in anyway. pipes are a function of the shell. you probably want to just look into using "/" in "make menuconfig" though to find/read sections...

you can have exec use the shell:
Code:
find . -name 'Kconfig' -exec sh -c 'grep CONFIG_MTD "$1" | grep depend' _ {} \;

with 2.6 Kconfig this seems to do maybe what you want;
Code:
find . -name 'Kconfig' -exec awk '$1=="config"&&$2~/^MTD/{s=$2}s&&/depends/{print s,$0;s=""}' {} \;

can't totally guarantee each of those depends are matched up though.
# 3  
Old 07-14-2012
Quote:
Originally Posted by neutronscott
-exec doesn't involve the shell in anyway. pipes are a function of the shell. you probably want to just look into using "/" in "make menuconfig" though to find/read sections...

you can have exec use the shell:
Code:
find . -name 'Kconfig' -exec sh -c 'grep CONFIG_MTD "$1" | grep depend' _ {} \;

.

and "grep _" here "_" ?



.
Quote:
with 2.6 Kconfig this seems to do maybe what you want;
Code:
find . -name 'Kconfig' -exec awk '$1=="config"&&$2~/^MTD/{s=$2}s&&/depends/{print s,$0;s=""}' {} \;

can't totally guarantee each of those depends are matched up though.
# 4  
Old 07-14-2012
Quote:
Originally Posted by yanglei_fage
Code:
find ./ -name *Kconfig -exec cat {}  \;

but it won't work with

Code:
find ./ -name *Kconfig -exec cat {} |grep CONFIG_MTD |grep depend \;

how could I handle this
You would get the desired result if you just piped the output of the first find into the greps. If your find supports -exec ... {} +, it would be more efficient.

However, the cat is unnecessary. The first grep can replace it in find's -exec.

You also need to quote -name's pattern argument.

Regards,
Alister
Last edited by alister; 07-14-2012 at 01:27 AM..
# 5  
Old 07-14-2012
Quote:
Originally Posted by alister
You would get the desired result if you just piped the output of the first find into the greps. If your find supports -exec ... {} +, it would be more efficient.

However, the cat is unnecessary. The first grep can replace it in find's -exec.

You also need to quote -name's pattern argument.

Regards,
Alister

I want to use find and then do the two operation for its output {}, can you give an examples?


Lei
# 6  
Old 07-14-2012
Quote:
Originally Posted by yanglei_fage
Code:
find ./ -name *Kconfig -exec cat {}  \;

but it won't work with

Code:
find ./ -name *Kconfig -exec cat {} |grep CONFIG_MTD |grep depend \;

how could I handle this
With this command you will output the names of the files in present dir whose name ends in Kconfig and for each of the found files it will show the entire lines containing both CONFIG_MTD and depend strings and the number of the matching lines:

Code:
find ./ -name '*Kconfig' -print0 | xargs -0 grep -n CONFIG_MTD | grep depend

Last edited by Tribe; 07-16-2012 at 02:51 PM..
This User Gave Thanks to Tribe For This Post:
244an
# 7  
Old 07-14-2012
Quote:
find ./ -name *Kconfig -exec cat {} |grep CONFIG_MTD |grep depend \;
Quick answer to post #1 is to not use exec or cat.
Code:
find ./ -type f -name '*Kconfig' -print | while read filename
do
      grep "CONFIG_MTD" "${filename}" |grep "depend"
done



Please remember to post what Operating System you have and what Shell you use.
Last edited by methyl; 07-15-2012 at 09:59 AM.. Reason: added missing quotes on filename
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