Shell Programming and Scripting

I have two files with users that I wanted to compare
filea looks like below

Code:

cn=abc
cn=xyz
cn=abc1
cn=abc2

fileb looks like below

Code:

cn=abc
cn=xyz
cn=abc1
cn=abc5

I wanted to write whoever exist in filea and not in fileb to filec
also wanted to write whoever exist in fileb and not in filea to filed

I was using following but it does not give me right output atleast when I compare filea with fileb

Code:

for line in `cat filea`
do
grep $line fileb
if [ $? -eq 0 ];then
echo $line >filec
fi
done

or if there is anyway that we can write a script that can query the ldap directory and run the comparison on line and give me the output.

I know I can use ldapsearch but not sure how I need to execute. The main goal is to compare the ldap directories and give the output whoever exist in ldap directory and not in ldap directory2.

Thanks

As far as the shell scripting question is concerned,
you could do something like this:

Code:

4.1.10(4)-release$ head file[ab]
==> filea <==
cn=abc
cn=xyz
cn=abc1
cn=abc2

==> fileb <==
cn=abc
cn=xyz
cn=abc1
cn=abc5
4.1.10(4)-release$ comm -3 <( sort filea ) <( sort fileb )
cn=abc2
        cn=abc5

Assuming your shell supports process substitution.

Thanks. but the comm command does not give me the output file with whatever users exist in file and not in fileb and vice versa. I wanted only missed users in output files so that I can make changes to import back to ldap directory.

can you post the sample output you would like to see..my head is spinning trying to decipher the above , but maybe that is just me from not having a cup of java today :-)

ok. Here is my file A

cn=abc
cn=xyz
cn=abc1
cn=abc2

and file B

cn=abc
cn=xyz
cn=abc1
cn=abc5

In first output file (users_not-exist-fileB.txt) I would like to see
cn=abc2
since that is not exist in file B

In second output file (users_not-exist-fileA.txt) I wanted to see
cn=abc5

as cn=abc5 is not exist in file A.

Hope this helps better.

Will this work for you:

Code:

egrep -xvf File2 File1

using gnu grep.

Code:

$ grep  -v -w -f /tmp/b /tmp/a
cn=abc2


$ grep  -v -w -f /tmp/a /tmp/b
cn=abc5