The .Nm utility
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.Ar arg2
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.Op Ar arg3 Op ...
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.Sh DESCRIPTION
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The
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.Nm
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is used to control the operation of medium changers, such as those found
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in tape and optical disk jukeboxes.
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utility is used to control the operation of medium changers, such as those
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found in tape and optical disk jukeboxes.
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.Op Fl o Ar N
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.Op Fl v Ar vector
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.Sh DESCRIPTION
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.Nm Bdes
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implements all
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The
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.Nm
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utility implements all
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.Tn DES
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modes of operation described in
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.%T "FIPS PUB 81" ,
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including alternative cipher feedback mode and both authentication
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modes.
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.Nm Bdes
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reads from the standard input and writes to the standard output.
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The
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.Nm
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utility reads from the standard input and writes to the standard output.
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By default, the input is encrypted using cipher block chaining mode.
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Using the same key for encryption and decryption preserves plain text.
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.Pp
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