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Top Forums UNIX for Dummies Questions & Answers differentiate between a file and a device Post 302201258 by Perderabo on Sunday 1st of June 2008 02:40:06 PM
Old 06-01-2008
Version 6?!? That is a very old exam you have there. I'm guessing '85 or so.

The answer is b, the mode bits. For a complete explanation see: https://www.unix.com/tips-tutorials/1...rmissions.html

But in that link, I use the term "block special" and "character special" for what you are collectively calling "device file".
 

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list_devices(1)                                                                                                                    list_devices(1)

NAME
list_devices - list allocatable devices SYNOPSIS
list_devices [-s] [ -U uid] -l [device] list_devices [-s] [ -U uid] -n [device] list_devices [-s] [ -U uid] -u [device] The list_devices utility lists the allocatable devices in the system according to specified qualifications. The device and all device special files associated with the device are listed. The device argument is optional and, if it is not present, all relevant devices are listed. The following options are supported: -l [device] Lists the pathname(s) of the device special files associated with the device that are allocatable to the current process. If device is given, lists only the files associated with the specified device. -n [device] Lists the pathname(s) of device special files associated with the device that are allocatable to the current process but are not currently allocated. If device is given, lists only the files associated with that device. -s Silent. Suppresses any diagnostic output. -u [device] Lists the pathname(s) of device special files, associated with the device that are allocated to the owner of the current process. If device is given, list only the files associated with that device. -U uid Uses the user ID uid instead of the real user ID of the current process when performing the list_devices operation. Only a user with the solaris.device.revoke authorization can use this option. The following exit values are returned: non--zero An error occurred. /etc/security/device_allocate /etc/security/device_maps /etc/security/dev/* /usr/security/lib/* See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ allocate(1), deallocate(1), bsmconv(1M), dminfo(1M), mkdevalloc(1M), mkdevmaps(1M), device_allocate(4), device_maps(4), attributes(5) The functionality described in this man page is available only if the Basic Security Module (BSM) has been enabled. See bsmconv(1M) for more information. /etc/security/dev, mkdevalloc(1M), and mkdevmaps(1M) might not be supported in a future release of the Solaris Operating Environment. 28 Mar 2005 list_devices(1)
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