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Replace and add line in file with line in another file based on matching string

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# 1  
Old 06-12-2013
Replace and add line in file with line in another file based on matching string
Hi,

I want to achieve something similar to what described in another post:


The difference is I want to add the line if the pattern is not found.

File 1:
Code:
A123, valueA, valueB
B234, valueA, valueB
C345, valueA, valueB
D456, valueA, valueB
E567, valueA, valueB
F678, valueA, valueB

File 2:
Code:
C345, valueX, valueY
D456, valueX, valueY
G789, value A, valueB

Output:
Code:
A123, valueA, valueB
B234, valueA, valueB
C345, valueX, valueY
D456, valueX, valueY
E567, valueA, valueB
F678, valueA, valueB
G789, value A, valueB

I am wondering how you can achieve it using awk.
The code:
Code:
awk -F, 'NR==FNR{a[$1]=$0;next;}a[$1]{$0=a[$1]}1' file2 file1

can only replace the value with existing pattern. How can I change it to add the line?

Please help!
# 2  
Old 06-12-2013
Try this:
Code:
awk -F, '
        NR == FNR {
                A[$1] = $0
                next
        }
        {
                B[$1] = $0
        }
        A[$1] {
                $0 = A[$1]
        }
        END {
                for ( k in A )
                {
                        if ( ! ( k in B ) )
                                print A[k]
                }
        }
        1
' file2 file1

These 2 Users Gave Thanks to Yoda For This Post:
jyu3 RavinderSingh13
# 3  
Old 06-13-2013
Code:
 awk -F"," 'NR==FNR{a[$1]=$0;next}
{print $0;delete a[$1]}
END {for (i in a){print a[i]}}' File1 file2 | sort

This User Gave Thanks to pravin27 For This Post:
jyu3
# 4  
Old 06-13-2013
Try
Code:
awk -F, 'NR==FNR{A[$1]++;print;next} !A[$1]++' file1 file2

# 5  
Old 06-13-2013
@pamu
This does not give correct output as requested, value from file2 is missing.
Code:
awk -F, 'NR==FNR{A[$1]++;print;next} !A[$1]++' f1 f2
A123, valueA, valueB
B234, valueA, valueB
C345, valueA, valueB
D456, valueA, valueB
E567, valueA, valueB
F678, valueA, valueB
G789, value A, valueB

# 6  
Old 06-13-2013
Quote:
Originally Posted by Jotne
@pamu
This does not give correct output as requested, value from file2 is missing.
Code:
awk -F, 'NR==FNR{A[$1]++;print;next} !A[$1]++' f1 f2
A123, valueA, valueB
B234, valueA, valueB
C345, valueA, valueB
D456, valueA, valueB
E567, valueA, valueB
F678, valueA, valueB
 G789, value A, valueB

Highlighted in red line belongs to file2 Smilie

Please check with OP's output
# 7  
Old 06-13-2013
Hi Pamu,

value from file2 is require if matching. In your case, it's printing from file1

Thanks
Pravin
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