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Shell Programming and Scripting

Problem writing a search script

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# 1  
Old 10-29-2011
Problem writing a search script
I trying to write a script in bash that take a list of users in “fileA” and searches another list user in “fileB” if the user does not exist in “file B” write the user to another file “file C”.

Please note “fileA” and “fileB” contains over 1000 users

Basically

Code:
“fileA”          “fileB”

Abc                 Tom
Def                 John
Tom                 Jonathan
Paul                 Paul
Wood              Graham

Result in FileC
Code:
Abc
Def
Wood

Here my attempt

Code:
for i in `cat fileA`; do grep –w $i fileB; test [$? –ne 0] && echo $i >fileC  fi; done

Can you help please my attempt is not working?
Thanks
Moderator's Comments:
Mod Comment
Please use code tags when posting data and code samples!
Last edited by vgersh99; 10-29-2011 at 06:32 PM.. Reason: code tags, please!
# 2  
Old 10-29-2011
Code:
nawk 'FNR==NR{fB[$0];next} !($0 in fB)' fileB fileA > fileC

# 3  
Old 10-31-2011
Hassan,

Your code looks fine except for below error:

Code:
 
for i in `cat fileA`; do grep -w $i fileB; test [$? -ne 0] && echo $i >>fileC  fi; done

You need ">>" before fileC so that the users are appended. Else only the last user in file1 that is not present in file2 would be present in file3.

Thanks,
Vijay V Menon
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