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If you set noclobber to on, bash won't allow redirection to overwrite existing files .
set -o noclobber command turn the option on (default it s off ) .
You can still append information but not overwrite the file .to turn it back off use : $ set +o noclobber .
I use it because i overwrite a file by accident , after thought , content of the file was very important , creating a one more file mean nothing for my hard disk (we are not anymore on the 64 k memory time) , but content of file is far much important . What we call exeprience :(
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