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you don't need to echo, just a plain redirect is enough to empty the file
There are 2 alternatives - vote for the best!
Empties all files in /var/log over 5000k. Useful if /var goes crazy or if you just haven't cleaned up in a while.
If you can do better, submit your command here.
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The bash for loop works, but you can do it with less typing with a single find command using find's -exec option:
find /var/log -type f -size +5000k -exec cp /dev/null {} \;this will invoke cp once for each file, copying /dev/null to it. They syntax of -exec just replaces {} with the name of each file found and runs cp. If you were just deleting those files, you could use the -delete option in place of -exec. See the "ACTIONS" section of the find manpage for more.
Why would you need to use this command when logrotate + cron does it for you already?