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Shell Programming and Scripting
How to redirect the import log to /dev/null?
Post 302277110 by Rhije on Thursday 15th of January 2009 12:28:11 PM
01-15-2009
Alright, so here is how error redirection works..
As you know, to send the STDOUT to /dev/null you do something like this: somecmd > /dev/null
So, to send STDERR to the same place, you can do:
somecmd 2> /dev/null
To send both STDOUT and STDERR to /dev/null you can do:
somecmd > /dev/null 2>&1
the 2 is writing to the same place that 1 is (which is dev null).. The &1 means "Whatever 1 is writing to".
Hopefully that explains it a bit better.
As you know, to send the STDOUT to /dev/null you do something like this: somecmd > /dev/null
So, to send STDERR to the same place, you can do:
somecmd 2> /dev/null
To send both STDOUT and STDERR to /dev/null you can do:
somecmd > /dev/null 2>&1
the 2 is writing to the same place that 1 is (which is dev null).. The &1 means "Whatever 1 is writing to".
Hopefully that explains it a bit better.
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LEARN ABOUT MOJAVE
null
null(n) null(n) __________________________________________________________________________________________________________________________________________________ NAME
null - Create and manipulate null channels SYNOPSIS
package require Tcl package require memchan null _________________________________________________________________ DESCRIPTION
The command described here is only available in a not-yet released version of the package. Use the CVS to get the sources. null creates a null channel which absorbs everything written into it. Reading from it is not possible, or rather will always return zero bytes. These channels are essentially Tcl-specific variants of the null device for unixoid operating systems (/dev/null). Transfer- ing the generated channel between interpreters is possible but does not make much sense. OPTIONS
Memory channels created by null provide one additional option to set or query. -delay ?milliseconds? A null channel is always writable and readable. This means that all fileevent-handlers will fire continuously. To avoid starvation of other event sources the events raised by this channel type have a configurable delay. This option is set in milliseconds and defaults to 5. A null channel is always writable and never readable. This means that a writable fileevent-handler will fire continuously and a readable fileevent-handler never at all. The exception to the latter is only the destruction of the channel which will cause the delivery of an eof event to a readable handler. SEE ALSO
fifo, fifo2, memchan, random, zero KEYWORDS
channel, i/o, in-memory channel, null COPYRIGHT
Copyright (c) 1996-2003 Andreas Kupries <andreas_kupries@users.sourceforge.net> Memory channels 2.2 null(n)