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Question
In linux, the null device (/dev/null) can be used to suppress the output of a command, to feed a command empty input, or similarly used when [...] .
Answer
a file is required for some feature in a configuration script (e.g. to specifying the user's shell to /dev/null, to disable shell access, in /etc/passwd)

Question
In linux, the null device (/dev/null) can be used to suppress the output of a command, to feed a command empty input, or similarly used when [...] .
Answer
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Question
In linux, the null device (/dev/null) can be used to suppress the output of a command, to feed a command empty input, or similarly used when [...] .
Answer
a file is required for some feature in a configuration script (e.g. to specifying the user's shell to /dev/null, to disable shell access, in /etc/passwd)
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18. UNIX Devices
verything save for error messages. make > /dev/null Then, of course, we can absorb all output including error messages with either make >& /dev/null or make > /dev/null 2>&1 <span>The device /dev/null finds innumerable uses in shell scripting to suppress the output of a command or to feed a command dummy (empty) input. /dev/null is a safe file from a security point of view. It is often used when a file is required for some feature in a configuration script, and you would like the particular feature disabled. For instance, specifying the users shell to /dev/null inside the password file will certainly prevent insecure use of a shell, and is an explicit way of saying that that account does not allow shell logins. You can also use /dev/null to create a file containing nothing: cat /dev/null > myfile or alternatively, to create a file containing only zeros. Try dd if=/dev/zero bs=1024 count=&lt

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