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Replace column that matches specific pattern, with column data from another file


 
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# 1  
Old 05-15-2012
Replace column that matches specific pattern, with column data from another file

Can anyone please help with this? I have 2 files as given below.
If 2nd column of file1 has pattern foo1@a, find the matching 1st column in file2 & replace 2nd column of file1 with file2's value.

Code:
file1

abc_1    foo1@a   ....
abc_1    soo2@a ...
def_2    soo2@a  ....
def_2    foo1@a .....
ghi_3    foo1@a .....
ghi_3    soo1@a

file2

Code:
def_2    foo2@a
def_2    soo2@a
abc_1     foo3@a
abc_1     soo1@a        
ghi_3      foo2@a
ghi_3    soo1@a

Required output ( file1 modified to be):

Code:
abc_1    foo3@a
abc_1    soo2@a
def_2    soo2@a
def_2    foo2@a
ghi_3    foo2@a
ghi_3    soo1@a

Moderator's Comments:
Mod Comment Code tags for code, please.

Last edited by Corona688; 05-15-2012 at 02:24 PM..
# 2  
Old 05-15-2012
Code:
awk 'NR==FNR { A[$1]=$2; O[++L]=$1; next }; ($1 in A) { A[$1]=$2 }; END { for(N=1; N<=L; N++) print O[N], A[O[N]]; }' file1 file2 > new_file1

# 3  
Old 05-15-2012
Hi! Thanks for the reply.It does not produce the desired output, though.
What I end up with is duplicate column2 for the same column1, in file1.
For example, the o/p from the awk code gives:
Code:
abc_1 soo1@a
abc_1 soo1@a
def_2 soo2@a
def_2 soo2@a
ghi_3 soo1@a
ghi_3 soo1@a


Last edited by Scrutinizer; 05-15-2012 at 02:38 PM.. Reason: code tags
# 4  
Old 05-15-2012
Code:
$ cat repcol.awk

NR==FNR && $1 { I[$1]++;        A[$1,I[$1]]=$2; next    }

$1 {    O[$1]++;        if( ($1 SUBSEP O[$1]) in A)     A[$1,O[$1]]=$2; }

END {
        for(X in A)
        {
                split(X, B, SUBSEP)
                print B[1],     A[X];
        }
}

$ awk -f repcol.awk data1 data2

abc_1 foo3@a
abc_1 soo1@a
def_2 foo2@a
ghi_3 foo2@a
def_2 soo2@a
ghi_3 soo1@a

$

# 5  
Old 05-15-2012
Thank you, it works! But it re-arranges the lines in file1.I'd like to keep the same order. Also, if there are multiple columns after column2( say column 3, column 4... column 8) in file1 that needs to be retained,how would the code have to be modified?
Your code o/p is now
Code:
ghi_3 foo2@a
ghi_3 soo1@a
abc_1 foo3@a
abc_1 soo1@a
def_2 foo2@a
def_2 soo2@a

---------- Post updated at 02:06 PM ---------- Previous update was at 01:12 PM ----------

Would you by any chance be able to modify the existing code to get that done?Also, would you pls. explain what you have here?

Last edited by Scrutinizer; 05-15-2012 at 03:13 PM.. Reason: code tags
# 6  
Old 05-15-2012
Bumping up posts or double posting is not permitted in these forums.

Please read the rules, which you agreed to when you registered, if you have not already done so.

You may receive an infraction for this. If so, don't worry, just try to follow the rules more carefully. The infraction will expire in the near future

Thank You.

The UNIX and Linux Forums.
# 7  
Old 05-15-2012
FYI, your bumping didn't even bring me here. I was reviewing my own posts for replies as I sometimes do.

Quote:
Originally Posted by prashali
Thank you, it works! But it re-arranges the lines in file1.I'd like to keep the same order. Also, if there are multiple columns after column2( say column 3, column 4... column 8) in file1 that needs to be retained,how would the code have to be modified?
Your original output didn't keep the columns, so neither did I.

Working on it.

Last edited by Corona688; 05-15-2012 at 05:18 PM..

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