04-27-2011
Great!
For 4 files with awk I tried:
awk 'ARGIND==1{a[$1]=$0 "null null null";next;}
ARGIND==2{if($1 in a)sub(/ null /, " "$1" ",a[$1]);else a[$1]="null "$1" null null";next; }
ARGIND==3{if($1 in a)sub(/ null$/," "$1" ",a[$1]); else a[$1]="null null "$1" null";}
ARGIND==4{if($1 in a)sub(/ null$/," "$1" ",a[$1]); else a[$1]="null null null "$1"";}
END{for(i in a)print a[i]}' file1 file2 file3 file4
Seems to work, only columns coming from file3 and file 4 a swapped...
Minor question, by some reason there are 13 spaces between columns 1 and 2, how come?
cyz
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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)