Shell Programming and Scripting

My files will be in following format.

File A
-----

AAAA A
BBBB B
CCCC C
DDDD D
EEEE E
FFFF F


File B :
---------
B
C
E
A

What Iam trying to do is first while looping the File B
take each line and then pattern matching in File A and then replace string in File B

After my process File B will become like below

File B:
----
BBBB
CCCC
EEEE
AAAA

Please provide me the replacement command. Thanks in advance

Deepak

InterChange $1 and $2 in aigles code

Code:

awk '
   NR==FNR { rep[$2] = $1; next; }
   { if ($1 in rep) $1 = rep[$1]; print; }
    ' fileA fileB > fileB.tmp
mv fileB.tmp fileB

Try this

grep -f fileB fileA | cut -f1 -d' '