Shell Programming and Scripting

I have a file (file1) with around 5000 records and another file (file2) with 50000 records.
I want to search each word in file 1 from file 2 and spew the output of the matches in file3.

Can someone please help me here.

I tried doing this in ksh

for i in `cat file1`
do
grep -w $i file2 >> file3
done

this doesn't seem to work

Sample
Contents of file1
----------------
dll3ma1.10
dll3ma1.10.1
dll3ma1.10.1.0
dll3ma1.10.1.0.142

Sample Contents of file 2
------------------------
dll3ma1.10
dll3ma1.10.4
dll3ma1.10.4.0
dll3ma1.10.4.0.140
dll3ma1.10.4.0.158
dll3ma1.10.4.0.144
dll3ma1.10.2
dll3ma1.10.2.0
dll3ma1.10.2.0.119
dll3ma1.10.4.0.141
dll3ma1.10.4.0.102
dll3ma1.10.4.0.145
dll3ma1.10.1
dll3ma1.10.3
dll3ma1.10.3.0
dll3ma1.10.3.0.121


The output I am expect in file3 should be
dll3ma1.10
dll3ma1.10.1

Code:

awk 'FNR==NR{
 a[$1]
 next
}
{
  if ( $1 in a ) print $1
}' file file1

/usr/local/bin/awk 'FNR==NR{ a[$1] next } { if ( $1 in a ) print $1 }' file1 file2
awk: cmd. line:1: FNR==NR{ a[$1] next } { if ( $1 in a ) print $1 }
awk: cmd. line:1: ^ parse error


Here file1 has the contents that I am looking for in file2

use nawk or gawk if you have it.

Same results

/usr/local/bin/gawk 'FNR==NR{ a[$1] next } { if ( $1 in a ) print $1 }' file1 file2
gawk: cmd. line:1: FNR==NR{ a[$1] next } { if ( $1 in a ) print $1 }
gawk: cmd. line:1: ^ parse error


/usr/bin/nawk 'FNR==NR{ a[$1] next } { if ( $1 in a ) print $1 }' file1 file2
/usr/bin/nawk: syntax error at source line 1
context is
FNR==NR{ a[$1] >>> next <<< } { if ( $1 in a ) print $1 }
/usr/bin/nawk: illegal statement at source line 1

try not putting them on one line!!

I believe the OP need only files compared line by line:

Code:

egrep -f file2 file1

my 2cents