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Full Discussion: How to list Matching Directories OR NULL w/o error message?
Top Forums Shell Programming and Scripting How to list Matching Directories OR NULL w/o error message? Post 302559553 by Tommyk on Tuesday 27th of September 2011 11:25:50 AM
Old 09-27-2011
Quote:
the "> /dev/null" uses the standard redirect into a "black hole" called "/dev/null" LOL.

How about the digit "2" ? Does the number "2" just kinda stands for "to", or does it hold some special meaning in this context?
the actual addition to the command is:

Code:
2> /dev/null

notice there is no space between the 2 and the >.

> means redirect standard output (stdout)
2> means redirect standard error (stderr)

and as your directing it into /dev/null it is written to a special file which discards anything sent to it.

you could do something like:

Code:
DATE_DIRS=$(ls -d 20* 2> /home/yourhome/error.out)

and then you can later see what error messages were sent from running the command but as you dont care /dev/null just discards the message for you.
This User Gave Thanks to Tommyk For This Post:
pgorbas
 

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LEARN ABOUT MOJAVE

mkdevmaps

mkdevmaps(1M)                                             System Administration Commands                                             mkdevmaps(1M)

NAME

       mkdevmaps - make device_maps entries

SYNOPSIS

       /usr/sbin/mkdevmaps

DESCRIPTION

       The  mkdevmaps  command  writes  to standard out a set of device_maps(4) entries describing the system's frame buffer, audio, and removable
       media devices.

       The mkdevmaps command is used by the init.d(4) scripts to create or update the /etc/security/device_maps file.

       Entries are generated based on the device special files found in /dev. For the different  categories  of  devices,  the  mkdevmaps  command
       checks for the following files under /dev:

       audio           /dev/audio, /dev/audioctl, /dev/sound/...
       tape            /dev/rst*, /dev/nrst*, /dev/rmt/...
       floppy          /dev/diskette, /dev/fd*, /dev/rdiskette, /dev/rfd*
       removable disk  /dev/dsk/c0t?d0s?, /dev/rdsk/c0t?d0s?
       frame buffer    /dev/fb

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+
       |Interface Stability          |Obsolete                     |
       +-----------------------------+-----------------------------+

SEE ALSO

       allocate(1), bsmconv(1M), attributes(5)

NOTES

       mkdevmaps might not be supported in a future release of the Solaris operating system.

SunOS 5.10                                                          8 Oct 2003                                                       mkdevmaps(1M)
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