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Full Discussion: Trouble with Shell Script Compressing file
Homework and Emergencies Homework & Coursework Questions Trouble with Shell Script Compressing file Post 302962631 by Don Cragun on Wednesday 16th of December 2015 04:20:04 PM
Old 12-16-2015
Quote:
Originally Posted by sea
Quote:
Do now show any output of the command
can be understood as redirecting any 'error message' to /dev/zero.
Like:
Code:
tar cvzf "$file1.tgz" "$file1" 2>/dev/zero

... ... ...
Although /dev/zero can be used this way on most systems, the conventional device for dumping output into the trash can is /dev/null which is described by the standards as:
Code:
/dev/null  An empty data source and infinite data sink. Data written to /dev/null shall be
           discarded. Reads from /dev/null shall always return end-of-file (EOF).

The standards do not require systems to provide /dev/zero.
This User Gave Thanks to Don Cragun For This Post:
sea
 

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LEARN ABOUT DEBIAN

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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