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Help with Awk

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# 1  
Old 04-20-2009
Help with Awk
I have two files:
FileA:
INGROUP GROUP
xyz, abc
tst, def
dev, ghi
prd, jkl

FileB

GROUP ID
abc, developer
def, tester
ghi, integrator
jkl, analyst

I want the following output

File C

INGroup ID
xyz, developer
tst, tester
dev, integrator
prd, analyst

I tried this using join since the real files are really large there is some discrepancy going on during sort.
I want to do this using awk
The following is the code i developed but would need further help

Code:
awk -F',' 'FNR=NR {a[$2]=$1;next} {if (a[$1]) print ????

Your help is appreciated
# 2  
Old 04-20-2009
Maybe try this?

awk >FileC 'NR==FNR{a[NR]=$2;next}{$2=a[FNR]}1' FileB FileA
# 3  
Old 04-21-2009
Quote:
Originally Posted by giannicello
Maybe try this?

awk >FileC 'NR==FNR{a[NR]=$2;next}{$2=a[FNR]}1' FileB FileA
This should work if the lines of both files are in the same order (parallel), otherwise:

Code:
awk -F", " 'NR==FNR{a[$2]=$1;next}a[$1]{print a[$1], $2}' OFS=", " FileA FileB

Regards
# 4  
Old 04-21-2009
Quote:
Originally Posted by Franklin52
This should work if the lines of both files are in the same order (parallel), otherwise:

Code:
awk -F", " 'NR==FNR{a[$2]=$1;next}a[$1]{print a[$1], $2}' OFS=", " FileA FileB

Regards
Thank you Franklin52 and giannicello
# 5  
Old 04-22-2009
Quote:
Originally Posted by zenith
Thank you Franklin52 and giannicello

Code:
awk -F", " 'NR==FNR{a[$2]=$1;next}a[$1]{print a[$1], $2}' OFS=", " FileA FileB

The issue with the above code i am getting is
If FileA has duplicate in second field i.e $2.How do i handle this.

HTML Code:
FileA:
INGROUP GROUP
xyz, abc
ink,abc
iji,abc
klm,abc
tst, def
dev, ghi
prd, jkl
# 6  
Old 04-22-2009
In that case:

Code:
awk -F", " 'NR==FNR{a[$1]=$2;next}a[$2]{print $1, a[$2]}' OFS=", " FileB FileA

Be sure you have the same fieldseparator (comma and a space).

Regards
# 7  
Old 04-22-2009
Quote:
Originally Posted by Franklin52
In that case:

Code:
awk -F", " 'NR==FNR{a[$1]=$2;next}a[$2]{print $1, a[$2]}' OFS=", " FileB FileA

Be sure you have the same fieldseparator (comma and a space).

Regards
This works good if FileB doesnt have duplicates in 2nd field. But data in FileB can come as duplicates as well.
How will i handle in this situation.
I am basically looking for a equi join between two files on field "group"
I tried sorting data and using join but that has its own issues and prefer doing it with awk.


FileB

GROUP ID
abc, developer
xyz, developer
tst, developer
klm, developer
def, tester
ghi, integrator
jkl, analyst

Appreciate your help
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