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Comparing columns in 2 text files

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# 8  
Old 12-13-2014
Once again, please use code tags .

Try this

Code:
 
 awk -F, 'FNR==NR{a[$1]=$7;next} {print (($1 in a) ? $0","a[$1] : $0",NA");}' file2 file1 > tmp && mv tmp file1

This rewrites/updates your File1
# 9  
Old 12-13-2014
So, do you want OK / NA separated with a space or with a comma? Try
Code:
awk     'FNR==NR        {T[$1]=$7; next}
                        {print $0 (NF==6?" ":",") (T[$1]?T[$1]:"NA")}
        ' FS="[ ,]" file2 file1
XX,ZZ,XC,EE,RR,BB OK,OK
XC,CF,FG,RG,GH,GH NA,NA

# 10  
Old 12-14-2014
yes this works , appends properly

Code:
 awk -F, 'FNR==NR{a[$1]=$7;next} {print (($1 in a) ? $0","a[$1] : $0",NA");}' file2 file1 > tmp && mv tmp file1

thanks all

Code:
[root@oc6120651657 shyam]# awk -F, 'FNR==NR{a[$1]=$7;next} {print (($1 in a) ? $0","a[$1] : $0",Nd");}' file2.txt file1.txt > tmp && mv tmp file1.txt
mv: overwrite `file1.txt'? y
[root@oc6120651657 shyam]# awk -F, 'FNR==NR{a[$1]=$7;next} {print (($1 in a) ? $0","a[$1] : $0",Nd");}' file2.txt file1.txt > tmp && mv tmp file1.txt
mv: overwrite `file1.txt'? y
[root@oc6120651657 shyam]# cat file1.txt
XX,ZZ,XC,EE,RR,BB,OK,OK
XC,CF,FG,RG,GH,GH,NA,NA

added new row in file1.txt
Code:
[root@oc6120651657 shyam]# vi file1.txt

DM,DF,GR,TH,EW,BB -> New row 

XX,ZZ,XC,EE,RR,BB,OK,OK
XC,CF,FG,RG,GH,GH,NA,NA
DM,DF,GR,TH,EW,BB

after that executing command it appends result in first column for newly added row .

Code:
[root@oc6120651657 shyam]# awk -F, 'FNR==NR{a[$1]=$7;next} {print (($1 in a) ? $0","a[$1] : $0",Nd");}' file2.txt file1.txt > tmp && mv tmp file1.txt
mv: overwrite `file1.txt'? y
[root@oc6120651657 shyam]# cat file1.txt
XX,ZZ,XC,EE,RR,BB,OK,OK,OK
XC,CF,FG,RG,GH,GH,NA,NA,NA
DM,DF,GR,TH,EW,BB,NA

how to print on 3 rd column for new added row on 3rd time execution

Code:
XX,ZZ,XC,EE,RR,BB,OK,OK,OK
XC,CF,FG,RG,GH,GH,NA,NA,NA
DM,DF,GR,TH,EW,BB, , ,NA

Last edited by Don Cragun; 12-14-2014 at 04:33 PM.. Reason: ADD CODE tags again!
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