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Is there something that allows me to move just the content of a file, and save it in another file? I know there is copytruncate, but I can't use logrotate in my setup. The file the content is moved from, has to stay as it is. Just the lines written would be transferred to another file. I need something that i can put in a bash script.

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I am not sure if this is the best way but you can try

cat file > new_file
truncate -s0 file

If the files are huge then you should keep looking for a better way.

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  • Why wouldnt it work with huge files ?
    – Meerkat
    Nov 4, 2016 at 10:37
  • The copying of data will take some time and if it is more than a few milliseconds, new data would be written to the file before truncate call is triggered. In case of huge files it can take seconds.
    – kn330
    Nov 4, 2016 at 10:46
  • If new Data would be coming in during the clearing, if thats whats you mean, that would be fine. Its a logfile in whitch is constantly in use
    – Meerkat
    Nov 4, 2016 at 12:04
  • You may use it then. I just wanted you to know the shortcomings of the script.
    – kn330
    Nov 4, 2016 at 12:08
  • So I tried you suggestion, and it seems to work, but there is one thing. All the Data that has been copied away has now been replaced with a @ in my test enviroment. Any idea why that is ?
    – Meerkat
    Nov 7, 2016 at 9:10
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For any new curiosity mongers: 

:> filename

Seen here.

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