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Bash output redirection limits?

I am trying to merge large files (some GB) in bash. I tried

cat file1 file2 file3 > result

and he did not work until

  cat file1 file2 file3 >> result

have worked. In both cases, the result of the file did not exist before, and I expected both commands to give the same result.

On the same system, I tried the same with small files (just a few bytes), and both commands produce the same output. I tried to find some explanation (for example here ), but could not find ...

So, I know how to solve my problem, but I'm still puzzled. Can anyone create a key?

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1 answer

when I need to split the file, I use a trick that works very well:

 tar --one-file-system -czv /home | split -b 4000m - /media/DRIVENAME/BACKUPNAME.tgz

then to recover:

cat /media/DRIVENAME/BACKUPNAME.tgz.* | tar -x /

therefore, the cat does the work regardless of the contents. Therefore, if this does not work, is there a bad production of your split files or a limitation of your file system. What file system are you using?

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