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To allocate standard input to /dev/null, the command syntax is as follows:

<pre>ucmd

ucmd [OPTIONS...] < /dev/null

</pre>

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If ucmd is executed as a background job (using the & operator), it will receive the SIGTTIN signal when ucmd tries to read from standard input. Background jobs cannot read their standard input from the terminal since the foreground job (or the shell) has it allocated. The ucmd job is stopped until it is brought to the foreground.

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