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Full Discussion: Problem in redirection of output
Top Forums Shell Programming and Scripting Problem in redirection of output Post 302459871 by aishsimplesweet on Tuesday 5th of October 2010 01:55:49 PM
Old 10-05-2010
Problem in redirection of output
Hi All,

i m facing very strange problem . like suppose i am in one directory and then i type ls
it will display the content of directory then i redirect the output as

Code:
sneha-pardus $   ls > test
sneha-pardus $   cat test
a.sh b.sh c.sh
sneha-pardus $ awk ' { print $1 } ' test > test
sneha-pardus $ cat test
sneha-pardus $

it shows nothing why can't we use same file in awk and then for redirection

please help me regarding this
Last edited by Scott; 10-05-2010 at 03:13 PM.. Reason: Code tags, please...
 

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LEARN ABOUT DEBIAN

xpacode

xpacode(7)							SAORD Documentation							xpacode(7)

NAME

       XPACode -  Where to Find Example/Test Code

SYNOPSIS

       The XPA source code directory contains two test programs, stest.c, and ctest.c that can serve as examples for writing XPA servers and
       clients, respectively.  They also can be used to test various features of XPA.

DESCRIPTION

       To build the XPA test programs, execute:

	  make All

       in the XPA source directory to generate the stest and ctest programs.  (NB: this should work on all platforms, although we have had prob-
       lems with unresolved externals on one Sun/Solaris machine, for reasons still unknown.)

       The stest program can be executed with no arguments to start an XPA server that contains the access points: xpa, xpa1, c_xpa (containing
       sub-commands cmd1 and cmd2), and i_xpa.	You then can use xpaset and xpaget to interact with these access points:

	 cat xpa.c | xpaset xpa      # send to xpa
	 cat xpa.c | xpaset "xpa*"   # send to xpa and xpa1
	 xpaget xpa		     # receive from xpa
	 xpaget xpa*		     # receive from xpa and xpa1

       etc. You also can use ctest to do the same thing, or to iterate:

	 ctest -s -l 100 xpa	    # send to xpa 100 times
	 ctest -s -l 100 "xpa*"     # send to xpa and xpa1 100 times
	 ctest -g -l 100 xpa	    # receive from xpa 100 times
	 ctest -g -l 100 "xpa*"     # receive from xpa and xpa1 100 times

       More options are available: see the stest.c and ctest.c code itself, which were used extensively to debug XPA.

       The file test.tcl in the XPA source directory gives examples for using the XPATclInterface.

SEE ALSO

       See xpa(7) for a list of XPA help pages

version 2.1.14							   June 7, 2012 							xpacode(7)
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