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Is there a way to empty a configuration file in Linux without deleting it so that it won't lose the permissions?

Thanks.

8
cat /dev/null > file.txt 

Executing this command will make the file blank.

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  • 12
    Or just > file.txt. Shorter, but also will empty the file. – lik Feb 11 '12 at 5:56
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Another solution is

printf '' > file

The >file trick has a slightly different behaviour depending on the used shell. In zsh for instance, it's required to terminate the redirection with ctrl-d if NULLCMD is set to cat (which is the default).

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  • To make > file work as in bash you simply need to set NULLCMD=:. The default is NULLCMD=cat, so > file is identical to cat > file which needs to be terminated by EOF, i.e. CTRL+D. – mpy Oct 10 '13 at 19:07

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