Answers for "linux remove content of file"

linux remove files except

/* " Be Careful !!! This will delete your folders recursively !!! " 
The below script was used to remove all files exept the last 5 in a pipline 
The ls -1v sorts the folders ascending by number. 
*/
sudo ls -1v | head -n -5 | xargs rm -r

unix delete file contents only

> filename