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Full Discussion: If test grep.... always returns 0 status
Top Forums Shell Programming and Scripting If test grep.... always returns 0 status Post 302532877 by jameswatson3 on Wednesday 22nd of June 2011 09:35:57 AM
Old 06-22-2011
If test grep.... always returns 0 status
Hi all. I am trying to compare and filter two files. I have a bigfile.txt of names and ids and a smallfile.txt of ids only. What I am trying to do is use a while read loop to read the ids in the bigfile and then echo the name and id only if the id exists in the small file. Basically, I'm trying to find the names that correspond to the ids in the small file.

Here's what I've got so far:
Code:
big=bigfile.txt
small=smallfile.txt

while read user id
do
    if test 'grep -q $id $small'; then
        echo "ID exists"
    else
        echo "ID does not exist"
    fi
done < $big

My problem now is that the first condition is always evaluated as true. No matter whether the id exists or not in the smallfile, the output is always the same - "ID Exists" for every line of input in bigfile.

I've manually confirmed that the exit code should be non-0 for multiple ids in bigfile. Any ideas on what I'm doing wrong?
 

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LEARN ABOUT MOJAVE

glgenqueries

GLGENQUERIES(3G)						    OpenGL 3.3							  GLGENQUERIES(3G)

NAME

       glGenQueries - generate query object names

C SPECIFICATION

       void glGenQueries(GLsizei n, GLuint * ids);

PARAMETERS

       n
	   Specifies the number of query object names to be generated.

       ids
	   Specifies an array in which the generated query object names are stored.

DESCRIPTION

       glGenQueries returns n query object names in ids. There is no guarantee that the names form a contiguous set of integers; however, it is
       guaranteed that none of the returned names was in use immediately before the call to glGenQueries.

       Query object names returned by a call to glGenQueries are not returned by subsequent calls, unless they are first deleted with
       glDeleteQueries().

       No query objects are associated with the returned query object names until they are first used by calling glBeginQuery().

ERRORS

       GL_INVALID_VALUE is generated if n is negative.

       GL_INVALID_OPERATION is generated if glGenQueries is executed between the execution of glBeginQuery() and the corresponding execution of
       glEndQuery().

ASSOCIATED GETS

       glIsQuery()

SEE ALSO

       glBeginQuery(), glDeleteQueries(), glEndQuery()

COPYRIGHT

       Copyright (C) 2005 Addison-Wesley. This material may be distributed subject to the terms and conditions set forth in the Open Publication
       License, v 1.0, 8 June 1999.  http://opencontent.org/openpub/.

OpenGL 3.3							    03/08/2011							  GLGENQUERIES(3G)
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