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anurade

03-10-2008 11:16 PM

Efficient way to read only 1st line from number of files

Hi,

I am struck up with some problem. I am analyzing on an efficient way to read number of files. Actually I want to read only the first line from each of them.
There could be hundreds of them in the directory/sub-directories; but not huge in size.
Can anyone suggest a way I can do it without compromising too much on memory and performance.

Thanks in advance.

/Anu

syg00

03-10-2008 11:32 PM

"head n=1" ???.
Stick it in a (bash) loop. Shouldn't be too onerous.

rnturn

03-31-2008 10:55 AM

Quote:

Originally Posted by anurade (Post 3084613)

... I want to read only the first line from each of them.
There could be hundreds of them in the directory/sub-directories

I'd use:

Code:

find . -type f -exec head -1 {} \;

Or, if you need the name of the file as its first line:

Code:

find . -type f | while read FN

do

  echo "$FN : head -1 $FN"

done

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