Question : shell script parse and grep

I have 4 columns in a file. in the fourth column I have something like janclient085, febclient 086.
I need to just cut the fourth column from the file and extract the client085, client086 and grep that in another
file which contains the client names. The clientXXX is the second column in the other file while the clientname is the
third column. I need to find out the client name and append that to clientXXX. I need to do this using shell script.
Please advise.

Answer : shell script parse and grep

perl -i -alpe 'if( @ARGV ){ $c{$F[4]}=" $F[2]" }else{ $_ .= $c{(split "/",$F[5])[-1]} }' client_name  client_num