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Old 10-21-2009, 09:54 AM   #1
Registered: Mar 2009
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Combine 10,000 small files into a big one

I got around 10,000 files inside a folder, each of them contains around 20-30 lines.

Is there some quick way (probably bash command) to combine them into a big one ?


This number of files cause 'cat *' to fail and it reminds me 'argument list too long'.

A Perl program is working on combing it anyway, but just a little bit slow to me.
Old 10-21-2009, 10:08 AM   #2
Registered: Sep 2005
Location: London, UK
Distribution: Debian
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This sort of thing?
for i in `ls -1`; do
    cat $i >> newfile.txt
EDIT: If the perl script is slow, I can't see the above being any quicker.

*gets more coffee*

Last edited by Lordandmaker; 10-21-2009 at 10:09 AM. Reason: noticed the OP's last line.
Old 10-21-2009, 10:16 AM   #3
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Assuming they're all in a single directory and there is nothing else there.
cd <directory>
find . -maxdepth 1 |grep -v <outputfile> |xargs cat >> <outputfile>

Of course you'd want to make sure where ever your outputfile is has enough space free to contain all your files output.


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